void Ehlo(CancellationToken cancellationToken)
{
SmtpResponse response;
response = SendEhlo (true, cancellationToken);
// Some SMTP servers do not accept an EHLO after authentication (despite the rfc saying it is required).
if (response.StatusCode == SmtpStatusCode.BadCommandSequence && capabilities != SmtpCapabilities.None)
return;
if (response.StatusCode != SmtpStatusCode.Ok) {
// Try sending HELO instead...
response = SendEhlo (false, cancellationToken);
if (response.StatusCode != SmtpStatusCode.Ok)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
} else {
// Clear the extensions
capabilities = SmtpCapabilities.None;
authmechs.Clear();
MaxSize = 0;
var lines = response.Response.Split ('\n');
for (int i = 0; i < lines.Length; i++) {
var capability = lines[i].Trim ();
if (capability.StartsWith ("AUTH", StringComparison.Ordinal)) {
int index = 4;
capabilities |= SmtpCapabilities.Authentication;
if (index < capability.Length && capability[index] == '=')
index++;
var mechanisms = capability.Substring (index);
foreach (var mechanism in mechanisms.Split (new [] { ' ' }, StringSplitOptions.RemoveEmptyEntries))
authmechs.Add (mechanism);
} else if (capability.StartsWith ("SIZE", StringComparison.Ordinal)) {
int index = 4;
uint size;
capabilities |= SmtpCapabilities.Size;
while (index < capability.Length && char.IsWhiteSpace (capability[index]))
index++;
if (uint.TryParse (capability.Substring (index), out size))
MaxSize = size;
} else if (capability == "BINARYMIME") {
capabilities |= SmtpCapabilities.BinaryMime;
} else if (capability == "CHUNKING") {
capabilities |= SmtpCapabilities.Chunking;
} else if (capability == "ENHANCEDSTATUSCODES") {
capabilities |= SmtpCapabilities.EnhancedStatusCodes;
} else if (capability == "8BITMIME") {
capabilities |= SmtpCapabilities.EightBitMime;
} else if (capability == "PIPELINING") {
capabilities |= SmtpCapabilities.Pipelining;
} else if (capability == "STARTTLS") {
capabilities |= SmtpCapabilities.StartTLS;
} else if (capability == "SMTPUTF8") {
capabilities |= SmtpCapabilities.UTF8;
}
}
}
}
/// <summary>
/// Establishes a connection to the specified SMTP server.
/// </summary>
/// <remarks>
/// <para>Establishes a connection to an SMTP or SMTP/S server. If the schema
/// in the uri is "smtp", a clear-text connection is made and defaults to using
/// port 25 if no port is specified in the URI. However, if the schema in the
/// uri is "smtps", an SSL connection is made using the
/// <see cref="ClientCertificates"/> and defaults to port 465 unless a port
/// is specified in the URI.</para>
/// <para>It should be noted that when using a clear-text SMTP connection,
/// if the server advertizes support for the STARTTLS extension, the client
/// will automatically switch into TLS mode before authenticating unless the
/// <paramref name="uri"/> contains a query string to disable it.</para>
/// If a successful connection is made, the <see cref="AuthenticationMechanisms"/>
/// and <see cref="Capabilities"/> properties will be populated.
/// </remarks>
/// <param name="uri">The server URI. The <see cref="System.Uri.Scheme"/> should either
/// be "smtp" to make a clear-text connection or "smtps" to make an SSL connection.</param>
/// <param name="cancellationToken">A cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// <para>The <paramref name="uri"/> is <c>null</c>.</para>
/// </exception>
/// <exception cref="System.ArgumentException">
/// The <paramref name="uri"/> is not an absolute URI.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="SmtpClient"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="SmtpClient"/> is already connected.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="SmtpCommandException">
/// An SMTP command failed.
/// </exception>
/// <exception cref="SmtpProtocolException">
/// An SMTP protocol error occurred.
/// </exception>
public void Connect(Uri uri, CancellationToken cancellationToken = default (CancellationToken))
{
CheckDisposed ();
if (uri == null)
throw new ArgumentNullException ("uri");
if (!uri.IsAbsoluteUri)
throw new ArgumentException ("The uri must be absolute.", "uri");
if (IsConnected)
throw new InvalidOperationException ("The SmtpClient is already connected.");
capabilities = SmtpCapabilities.None;
authmechs.Clear ();
MaxSize = 0;
var smtps = uri.Scheme.ToLowerInvariant () == "smtps";
var port = uri.Port > 0 ? uri.Port : (smtps ? 465 : 25);
var query = uri.ParsedQuery ();
SmtpResponse response = null;
string value;
var starttls = !smtps && (!query.TryGetValue ("starttls", out value) || Convert.ToBoolean (value));
#if !NETFX_CORE
var ipAddresses = Dns.GetHostAddresses (uri.DnsSafeHost);
Socket socket = null;
for (int i = 0; i < ipAddresses.Length; i++) {
socket = new Socket (ipAddresses[i].AddressFamily, SocketType.Stream, ProtocolType.Tcp);
cancellationToken.ThrowIfCancellationRequested ();
try {
socket.Connect (ipAddresses[i], port);
localEndPoint = socket.LocalEndPoint;
break;
} catch {
if (i + 1 == ipAddresses.Length)
throw;
}
}
if (smtps) {
var ssl = new SslStream (new NetworkStream (socket, true), false, ValidateRemoteCertificate);
ssl.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Default, true);
stream = ssl;
} else {
stream = new NetworkStream (socket, true);
}
#else
socket = new StreamSocket ();
cancellationToken.ThrowIfCancellationRequested ();
socket.ConnectAsync (new HostName (uri.DnsSafeHost), port.ToString (), smtps ? SocketProtectionLevel.Tls12 : SocketProtectionLevel.PlainSocket)
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
stream = new DuplexStream (socket.InputStream.AsStreamForRead (), socket.OutputStream.AsStreamForWrite ());
#endif
if (stream.CanTimeout) {
stream.WriteTimeout = timeout;
stream.ReadTimeout = timeout;
}
host = uri.Host;
logger.LogConnect (uri);
try {
// read the greeting
response = ReadResponse (cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
// Send EHLO and get a list of supported extensions
Ehlo (cancellationToken);
if (starttls && (capabilities & SmtpCapabilities.StartTLS) != 0) {
response = SendCommand ("STARTTLS", cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
#if !NETFX_CORE
var tls = new SslStream (stream, false, ValidateRemoteCertificate);
tls.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Tls, true);
stream = tls;
#else
socket.UpgradeToSslAsync (SocketProtectionLevel.Tls12, new HostName (uri.DnsSafeHost))
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
#endif
// Send EHLO again and get the new list of supported extensions
Ehlo (cancellationToken);
}
IsConnected = true;
} catch {
stream.Dispose ();
stream = null;
throw;
}
}
internal void ReplayConnect(string hostName, Stream replayStream, CancellationToken cancellationToken)
{
CheckDisposed ();
if (hostName == null)
throw new ArgumentNullException ("hostName");
if (replayStream == null)
throw new ArgumentNullException ("replayStream");
#if !NETFX_CORE
localEndPoint = new IPEndPoint (IPAddress.Loopback, 25);
#endif
capabilities = SmtpCapabilities.None;
stream = replayStream;
authmechs.Clear ();
host = hostName;
MaxSize = 0;
try {
// read the greeting
var response = ReadResponse (cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
// Send EHLO and get a list of supported extensions
Ehlo (cancellationToken);
IsConnected = true;
} catch {
stream.Dispose ();
stream = null;
throw;
}
}
/// <summary>
/// Establishes a connection to the specified SMTP or SMTP/S server.
/// </summary>
/// <remarks>
/// <para>Establishes a connection to the specified SMTP or SMTP/S server.</para>
/// <para>If the <paramref name="port"/> has a value of <c>0</c>, then the
/// <paramref name="options"/> parameter is used to determine the default port to
/// connect to. The default port used with <see cref="SecureSocketOptions.SslOnConnect"/>
/// is <c>465</c>. All other values will use a default port of <c>25</c>.</para>
/// <para>If the <paramref name="options"/> has a value of
/// <see cref="SecureSocketOptions.Auto"/>, then the <paramref name="port"/> is used
/// to determine the default security options. If the <paramref name="port"/> has a value
/// of <c>465</c>, then the default options used will be
/// <see cref="SecureSocketOptions.SslOnConnect"/>. All other values will use
/// <see cref="SecureSocketOptions.StartTlsWhenAvailable"/>.</para>
/// <para>Once a connection is established, properties such as
/// <see cref="AuthenticationMechanisms"/> and <see cref="Capabilities"/> will be
/// populated.</para>
/// <para>Note: The connection established by any of the
/// <a href="Overload_MailKit_Net_Smtp_SmtpClient_Connect.htm">Connect</a>
/// methods may be re-used if an application wishes to send multiple messages
/// to the same SMTP server. Since connecting and authenticating can be expensive
/// operations, re-using a connection can significantly improve performance when
/// sending a large number of messages to the same SMTP server over a short
/// period of time.</para>
/// </remarks>
/// <example>
/// <code language="c#" source="Examples\SmtpExamples.cs" region="SendMessage"/>
/// </example>
/// <param name="host">The host name to connect to.</param>
/// <param name="port">The port to connect to. If the specified port is <c>0</c>, then the default port will be used.</param>
/// <param name="options">The secure socket options to when connecting.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="host"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentOutOfRangeException">
/// <paramref name="port"/> is not between <c>0</c> and <c>65535</c>.
/// </exception>
/// <exception cref="System.ArgumentException">
/// The <paramref name="host"/> is a zero-length string.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="SmtpClient"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="SmtpClient"/> is already connected.
/// </exception>
/// <exception cref="System.NotSupportedException">
/// <paramref name="options"/> was set to
/// <see cref="MailKit.Security.SecureSocketOptions.StartTls"/>
/// and the SMTP server does not support the STARTTLS extension.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="SmtpCommandException">
/// An SMTP command failed.
/// </exception>
/// <exception cref="SmtpProtocolException">
/// An SMTP protocol error occurred.
/// </exception>
public override void Connect (string host, int port = 0, SecureSocketOptions options = SecureSocketOptions.Auto, CancellationToken cancellationToken = default (CancellationToken))
{
if (host == null)
throw new ArgumentNullException ("host");
if (host.Length == 0)
throw new ArgumentException ("The host name cannot be empty.", "host");
if (port < 0 || port > 65535)
throw new ArgumentOutOfRangeException ("port");
CheckDisposed ();
if (IsConnected)
throw new InvalidOperationException ("The SmtpClient is already connected.");
capabilities = SmtpCapabilities.None;
AuthenticationMechanisms.Clear ();
MaxSize = 0;
SmtpResponse response;
Stream stream;
bool starttls;
Uri uri;
ComputeDefaultValues (host, ref port, ref options, out uri, out starttls);
#if !NETFX_CORE
var ipAddresses = Dns.GetHostAddresses (host);
Socket socket = null;
for (int i = 0; i < ipAddresses.Length; i++) {
socket = new Socket (ipAddresses[i].AddressFamily, SocketType.Stream, ProtocolType.Tcp);
try {
cancellationToken.ThrowIfCancellationRequested ();
if (LocalEndPoint != null)
socket.Bind (LocalEndPoint);
socket.Connect (ipAddresses[i], port);
break;
} catch (OperationCanceledException) {
socket.Dispose ();
socket = null;
throw;
} catch {
socket.Dispose ();
socket = null;
if (i + 1 == ipAddresses.Length)
throw;
}
}
if (socket == null)
throw new IOException (string.Format ("Failed to resolve host: {0}", host));
this.host = host;
if (options == SecureSocketOptions.SslOnConnect) {
var ssl = new SslStream (new NetworkStream (socket, true), false, ValidateRemoteCertificate);
ssl.AuthenticateAsClient (host, ClientCertificates, SslProtocols, true);
stream = ssl;
} else {
stream = new NetworkStream (socket, true);
}
#else
var protection = options == SecureSocketOptions.SslOnConnect ? SocketProtectionLevel.Tls12 : SocketProtectionLevel.PlainSocket;
var socket = new StreamSocket ();
try {
cancellationToken.ThrowIfCancellationRequested ();
socket.ConnectAsync (new HostName (host), port.ToString (), protection)
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
} catch {
socket.Dispose ();
throw;
}
stream = new DuplexStream (socket.InputStream.AsStreamForRead (0), socket.OutputStream.AsStreamForWrite (0));
#endif
if (stream.CanTimeout) {
stream.WriteTimeout = timeout;
stream.ReadTimeout = timeout;
}
ProtocolLogger.LogConnect (uri);
Stream = new SmtpStream (stream, socket, ProtocolLogger);
try {
// read the greeting
response = Stream.ReadResponse (cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
// Send EHLO and get a list of supported extensions
Ehlo (cancellationToken);
if (options == SecureSocketOptions.StartTls && (capabilities & SmtpCapabilities.StartTLS) == 0)
throw new NotSupportedException ("The SMTP server does not support the STARTTLS extension.");
if (starttls && (capabilities & SmtpCapabilities.StartTLS) != 0) {
response = SendCommand ("STARTTLS", cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
#if !NETFX_CORE
var tls = new SslStream (stream, false, ValidateRemoteCertificate);
tls.AuthenticateAsClient (host, ClientCertificates, SslProtocols, true);
Stream.Stream = tls;
#else
socket.UpgradeToSslAsync (SocketProtectionLevel.Tls12, new HostName (host))
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
#endif
// Send EHLO again and get the new list of supported extensions
Ehlo (cancellationToken);
}
connected = true;
} catch {
Stream.Dispose ();
Stream = null;
throw;
}
OnConnected ();
}
/// <summary>
/// Establish a connection to the specified SMTP or SMTP/S server using the provided socket.
/// </summary>
/// <remarks>
/// <para>Establishes a connection to the specified SMTP or SMTP/S server.</para>
/// <para>If the <paramref name="port"/> has a value of <c>0</c>, then the
/// <paramref name="options"/> parameter is used to determine the default port to
/// connect to. The default port used with <see cref="SecureSocketOptions.SslOnConnect"/>
/// is <c>465</c>. All other values will use a default port of <c>25</c>.</para>
/// <para>If the <paramref name="options"/> has a value of
/// <see cref="SecureSocketOptions.Auto"/>, then the <paramref name="port"/> is used
/// to determine the default security options. If the <paramref name="port"/> has a value
/// of <c>465</c>, then the default options used will be
/// <see cref="SecureSocketOptions.SslOnConnect"/>. All other values will use
/// <see cref="SecureSocketOptions.StartTlsWhenAvailable"/>.</para>
/// <para>Once a connection is established, properties such as
/// <see cref="AuthenticationMechanisms"/> and <see cref="Capabilities"/> will be
/// populated.</para>
/// <para>Note: The connection established by any of the
/// <a href="Overload_MailKit_Net_Smtp_SmtpClient_Connect.htm">Connect</a>
/// methods may be re-used if an application wishes to send multiple messages
/// to the same SMTP server. Since connecting and authenticating can be expensive
/// operations, re-using a connection can significantly improve performance when
/// sending a large number of messages to the same SMTP server over a short
/// period of time.</para>
/// </remarks>
/// <param name="socket">The socket to use for the connection.</param>
/// <param name="host">The host name to connect to.</param>
/// <param name="port">The port to connect to. If the specified port is <c>0</c>, then the default port will be used.</param>
/// <param name="options">The secure socket options to when connecting.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// <para><paramref name="socket"/> is <c>null</c>.</para>
/// <para>-or-</para>
/// <para><paramref name="host"/> is <c>null</c>.</para>
/// </exception>
/// <exception cref="System.ArgumentOutOfRangeException">
/// <paramref name="port"/> is not between <c>0</c> and <c>65535</c>.
/// </exception>
/// <exception cref="System.ArgumentException">
/// <para><paramref name="socket"/> is not connected.</para>
/// <para>-or-</para>
/// The <paramref name="host"/> is a zero-length string.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="SmtpClient"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="SmtpClient"/> is already connected.
/// </exception>
/// <exception cref="System.NotSupportedException">
/// <paramref name="options"/> was set to
/// <see cref="MailKit.Security.SecureSocketOptions.StartTls"/>
/// and the SMTP server does not support the STARTTLS extension.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="SmtpCommandException">
/// An SMTP command failed.
/// </exception>
/// <exception cref="SmtpProtocolException">
/// An SMTP protocol error occurred.
/// </exception>
public void Connect (Socket socket, string host, int port = 0, SecureSocketOptions options = SecureSocketOptions.Auto, CancellationToken cancellationToken = default (CancellationToken))
{
if (socket == null)
throw new ArgumentNullException ("socket");
if (!socket.Connected)
throw new ArgumentException ("The socket is not connected.", "socket");
if (host == null)
throw new ArgumentNullException ("host");
if (host.Length == 0)
throw new ArgumentException ("The host name cannot be empty.", "host");
if (port < 0 || port > 65535)
throw new ArgumentOutOfRangeException ("port");
CheckDisposed ();
if (IsConnected)
throw new InvalidOperationException ("The SmtpClient is already connected.");
capabilities = SmtpCapabilities.None;
AuthenticationMechanisms.Clear ();
MaxSize = 0;
SmtpResponse response;
Stream stream;
bool starttls;
Uri uri;
ComputeDefaultValues (host, ref port, ref options, out uri, out starttls);
this.host = host;
if (options == SecureSocketOptions.SslOnConnect) {
var ssl = new SslStream (new NetworkStream (socket, true), false, ValidateRemoteCertificate);
ssl.AuthenticateAsClient (host, ClientCertificates, SslProtocols, true);
stream = ssl;
} else {
stream = new NetworkStream (socket, true);
}
if (stream.CanTimeout) {
stream.WriteTimeout = timeout;
stream.ReadTimeout = timeout;
}
ProtocolLogger.LogConnect (uri);
Stream = new SmtpStream (stream, socket, ProtocolLogger);
try {
// read the greeting
response = Stream.ReadResponse (cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
// Send EHLO and get a list of supported extensions
Ehlo (cancellationToken);
if (options == SecureSocketOptions.StartTls && (capabilities & SmtpCapabilities.StartTLS) == 0)
throw new NotSupportedException ("The SMTP server does not support the STARTTLS extension.");
if (starttls && (capabilities & SmtpCapabilities.StartTLS) != 0) {
response = SendCommand ("STARTTLS", cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
var tls = new SslStream (stream, false, ValidateRemoteCertificate);
tls.AuthenticateAsClient (host, ClientCertificates, SslProtocols, true);
Stream.Stream = tls;
// Send EHLO again and get the new list of supported extensions
Ehlo (cancellationToken);
}
connected = true;
} catch {
Stream.Dispose ();
Stream = null;
throw;
}
OnConnected ();
}
internal void ReplayConnect (string hostName, Stream replayStream, CancellationToken cancellationToken = default (CancellationToken))
{
CheckDisposed ();
if (hostName == null)
throw new ArgumentNullException ("hostName");
if (replayStream == null)
throw new ArgumentNullException ("replayStream");
Stream = new SmtpStream (replayStream, null, ProtocolLogger);
capabilities = SmtpCapabilities.None;
AuthenticationMechanisms.Clear ();
host = hostName;
MaxSize = 0;
try {
// read the greeting
var response = Stream.ReadResponse (cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
// Send EHLO and get a list of supported extensions
Ehlo (cancellationToken);
connected = true;
} catch {
Stream.Dispose ();
Stream = null;
throw;
}
OnConnected ();
}
public ContentTransferEncodingVisitor (SmtpCapabilities capabilities)
{
Capabilities = capabilities;
}
void Disconnect ()
{
capabilities = SmtpCapabilities.None;
authenticated = false;
connected = false;
secure = false;
host = null;
if (Stream != null) {
Stream.Dispose ();
Stream = null;
}
OnDisconnected ();
}
public Task <MailSentStatus> Send(EMailEnvelop EMailEnvelop,
Byte NumberOfRetries = 3,
Boolean AutoStart = true)
{
var SendMailTask = new Task <MailSentStatus>(() => {
lock (this) {
switch (Connect())
{
case Sockets.TCP.TCPConnectResult.InvalidDomainName:
return(MailSentStatus.failed);
case Sockets.TCP.TCPConnectResult.NoIPAddressFound:
return(MailSentStatus.failed);
case Sockets.TCP.TCPConnectResult.UnknownError:
return(MailSentStatus.failed);
case Sockets.TCP.TCPConnectResult.Ok:
// 220 mail.ahzf.de ESMTP Postfix (Debian/GNU)
var LoginResponse = this.ReadSMTPResponse();
if (LoginResponse.StatusCode != SMTPStatusCode.ServiceReady)
{
throw new SMTPClientException("SMTP login error: " + LoginResponse.ToString());
}
switch (LoginResponse.StatusCode)
{
case SMTPStatusCode.ServiceReady:
#region Send EHLO
var EHLOResponses = SendCommandAndWaits("EHLO " + LocalDomain);
// 250-mail.ahzf.de
// 250-PIPELINING
// 250-SIZE 30720000
// 250-VRFY
// 250-ETRN
// 250-STARTTLS
// 250-AUTH LOGIN DIGEST-MD5 PLAIN CRAM-MD5
// 250-AUTH=LOGIN DIGEST-MD5 PLAIN CRAM-MD5
// 250-ENHANCEDSTATUSCODES
// 250-8BITMIME
// 250 DSN
if (EHLOResponses.Any(v => v.StatusCode != SMTPStatusCode.Ok))
{
var Error = EHLOResponses.Where(v => v.StatusCode != SMTPStatusCode.Ok).
FirstOrDefault();
if (Error.StatusCode != SMTPStatusCode.Ok)
{
throw new SMTPClientException("SMTP EHLO command error: " + Error.ToString());
}
}
#endregion
#region Check for STARTTLS
if (UseTLS == TLSUsage.STARTTLS)
{
if (EHLOResponses.Any(v => v.Response == "STARTTLS"))
{
var StartTLSResponse = SendCommandAndWait("STARTTLS");
if (StartTLSResponse.StatusCode == SMTPStatusCode.ServiceReady)
{
EnableTLS();
}
}
else
{
throw new Exception("TLS is not supported by the SMTP server!");
}
// Send EHLO again in order to get the new list of supported extensions!
EHLOResponses = SendCommandAndWaits("EHLO " + LocalDomain);
}
#endregion
#region Analyze EHLO responses and set SMTP capabilities
// 250-mail.ahzf.de
// 250-PIPELINING
// 250-SIZE 30720000
// 250-VRFY
// 250-ETRN
// 250-STARTTLS
// 250-AUTH LOGIN DIGEST-MD5 PLAIN CRAM-MD5
// 250-AUTH=LOGIN DIGEST-MD5 PLAIN CRAM-MD5
// 250-ENHANCEDSTATUSCODES
// 250-8BITMIME
// 250 DSN
var MailServerName = EHLOResponses.FirstOrDefault();
EHLOResponses.Skip(1).ForEach(v => {
#region PIPELINING
if (v.Response == "PIPELINING")
{
Capabilities |= SmtpCapabilities.Pipelining;
}
#endregion
#region SIZE
else if (v.Response.StartsWith("SIZE "))
{
Capabilities |= SmtpCapabilities.Size;
if (!UInt64.TryParse(v.Response.Substring(5), out _MaxMailSize))
{
throw new Exception("Invalid SIZE capability!");
}
}
#endregion
// else if (v.Response == "VRFY")
// Capabilities |= SmtpCapabilities.;
// else if (v.Response == "ETRN")
// Capabilities |= SmtpCapabilities.;
#region STARTTLS
if (v.Response == "STARTTLS")
{
Capabilities |= SmtpCapabilities.StartTLS;
}
#endregion
#region AUTH
else if (v.Response.StartsWith("AUTH "))
{
Capabilities |= SmtpCapabilities.Authentication;
SMTPAuthMethods ParsedAuthMethod;
var AuthType = v.Response.Substring(4, 1);
var AuthMethods = v.Response.Substring(5).Split(' ');
// GMail: "AUTH LOGIN PLAIN XOAUTH XOAUTH2 PLAIN-CLIENTTOKEN"
foreach (var AuthMethod in AuthMethods)
{
if (Enum.TryParse <SMTPAuthMethods>(AuthMethod.Replace('-', '_'), true, out ParsedAuthMethod))
{
if (AuthType == " ")
{
_AuthMethods |= ParsedAuthMethod;
}
}
else
{
_UnknownAuthMethods.Add(AuthMethod);
}
}
}
#endregion
#region ENHANCEDSTATUSCODES
if (v.Response == "ENHANCEDSTATUSCODES")
{
Capabilities |= SmtpCapabilities.EnhancedStatusCodes;
}
#endregion
#region 8BITMIME
if (v.Response == "8BITMIME")
{
Capabilities |= SmtpCapabilities.EightBitMime;
}
#endregion
#region DSN
if (v.Response == "DSN")
{
Capabilities |= SmtpCapabilities.Dsn;
}
#endregion
#region BINARYMIME
if (v.Response == "BINARYMIME")
{
Capabilities |= SmtpCapabilities.BinaryMime;
}
#endregion
#region CHUNKING
if (v.Response == "CHUNKING")
{
Capabilities |= SmtpCapabilities.Chunking;
}
#endregion
#region UTF8
if (v.Response == "UTF8")
{
Capabilities |= SmtpCapabilities.UTF8;
}
#endregion
});
#endregion
#region Auth PLAIN...
if (_AuthMethods.HasFlag(SMTPAuthMethods.PLAIN))
{
var AuthPLAINResponse = SendCommandAndWait("AUTH PLAIN " +
Convert.ToBase64String(ByteZero.
Concat(_Login.ToUTF8Bytes()).
Concat(ByteZero).
Concat(_Password.ToUTF8Bytes()).
ToArray()));
}
#endregion
#region ...or Auth LOGIN...
else if (_AuthMethods.HasFlag(SMTPAuthMethods.LOGIN))
{
var AuthLOGIN1Response = SendCommandAndWait("AUTH LOGIN");
var AuthLOGIN2Response = SendCommandAndWait(Convert.ToBase64String(_Login.ToUTF8Bytes()));
var AuthLOGIN3Response = SendCommandAndWait(Convert.ToBase64String(_Password.ToUTF8Bytes()));
}
#endregion
#region ...or AUTH CRAM-MD5
else if (_AuthMethods.HasFlag(SMTPAuthMethods.CRAM_MD5))
{
var AuthCRAMMD5Response = SendCommandAndWait("AUTH CRAM-MD5");
if (AuthCRAMMD5Response.StatusCode == SMTPStatusCode.AuthenticationChallenge)
{
var aa = Ext2.CRAM_MD5("<*****@*****.**>",
"tim", "tanstaaftanstaaf");
var a2 = Convert.ToBase64String(aa) == "dGltIGI5MTNhNjAyYzdlZGE3YTQ5NWI0ZTZlNzMzNGQzODkw";
var bb = Ext2.CRAM_MD5("<*****@*****.**>",
"alice", "wonderland");
var b2 = Convert.ToBase64String(bb) == "YWxpY2UgNjRiMmE0M2MxZjZlZDY4MDZhOTgwOTE0ZTIzZTc1ZjA=";
var cc = Ext2.CRAM_MD5("<*****@*****.**>", "ahzf", "ahzf2305!");
var zz = Ext2.CRAM_MD5(Convert.FromBase64String(AuthCRAMMD5Response.Response).ToUTF8String(),
_Login, _Password);
var AuthPLAINResponse = SendCommandAndWait(Convert.ToBase64String(zz));
}
}
#endregion
#region MAIL FROM:
foreach (var MailFrom in EMailEnvelop.MailFrom)
{
// MAIL FROM:<*****@*****.**>
/// 250 2.1.0 Ok
var MailFromCommand = "MAIL FROM: <" + MailFrom.Address.ToString() + ">";
if (Capabilities.HasFlag(SmtpCapabilities.EightBitMime))
{
MailFromCommand += " BODY=8BITMIME";
}
else if (Capabilities.HasFlag(SmtpCapabilities.BinaryMime))
{
MailFromCommand += " BODY=BINARYMIME";
}
var _MailFromResponse = SendCommandAndWait(MailFromCommand);
if (_MailFromResponse.StatusCode != SMTPStatusCode.Ok)
{
throw new SMTPClientException("SMTP MAIL FROM command error: " + _MailFromResponse.ToString());
}
}
#endregion
#region RCPT TO(s):
// RCPT TO:<*****@*****.**>
/// 250 2.1.5 Ok
EMailEnvelop.RcptTo.ForEach(Rcpt => {
var _RcptToResponse = SendCommandAndWait("RCPT TO: <" + Rcpt.Address.ToString() + ">");
switch (_RcptToResponse.StatusCode)
{
case SMTPStatusCode.UserNotLocalWillForward:
case SMTPStatusCode.Ok:
break;
case SMTPStatusCode.UserNotLocalTryAlternatePath:
case SMTPStatusCode.MailboxNameNotAllowed:
case SMTPStatusCode.MailboxUnavailable:
case SMTPStatusCode.MailboxBusy:
// throw new SmtpCommandException(SmtpErrorCode.RecipientNotAccepted, _RcptToResponse.StatusCode, mailbox, _RcptToResponse.Response);
case SMTPStatusCode.AuthenticationRequired:
throw new UnauthorizedAccessException(_RcptToResponse.Response);
//default:
// throw new SmtpCommandException(SmtpErrorCode.UnexpectedStatusCode, _RcptToResponse.StatusCode, _RcptToResponse.Response);
}
//Debug.WriteLine(_RcptToResponse);
});
#endregion
#region Mail DATA
// The encoded MIME text lines must not be longer than 76 characters!
/// 354 End data with <CR><LF>.<CR><LF>
var _DataResponse = SendCommandAndWait("DATA");
if (_DataResponse.StatusCode != SMTPStatusCode.StartMailInput)
{
throw new SMTPClientException("SMTP DATA command error: " + _DataResponse.ToString());
}
// Send e-mail headers...
if (EMailEnvelop.Mail != null)
{
EMailEnvelop.Mail.
Header.
Select(header => header.Key + ": " + header.Value).
ForEach(line => SendCommand(line));
//SendCommand("Message-Id: <" + (EMailEnvelop.Mail.MessageId != null
// ? EMailEnvelop.Mail.MessageId.ToString()
// : GenerateMessageId(EMailEnvelop.Mail, RemoteHost).ToString()) + ">");
SendCommand("");
// Send e-mail body(parts)...
//if (EMailEnvelop.Mail.MailBody != null)
//{
EMailEnvelop.Mail.Body.ToText(false).ForEach(line => SendCommand(line));
SendCommand("");
//}
}
else if (EMailEnvelop.Mail.ToText != null)
{
EMailEnvelop.Mail.ToText.ForEach(line => SendCommand(line));
SendCommand("");
}
#endregion
#region End-of-DATA
/// .
/// 250 2.0.0 Ok: queued as 83398728027
var _FinishedResponse = SendCommandAndWait(".");
if (_FinishedResponse.StatusCode != SMTPStatusCode.Ok)
{
throw new SMTPClientException("SMTP DATA '.' command error: " + _FinishedResponse.ToString());
}
#endregion
#region QUIT
/// QUIT
/// 221 2.0.0 Bye
var _QuitResponse = SendCommandAndWait("QUIT");
if (_QuitResponse.StatusCode != SMTPStatusCode.ServiceClosingTransmissionChannel)
{
throw new SMTPClientException("SMTP QUIT command error: " + _QuitResponse.ToString());
}
#endregion
break;
}
return(MailSentStatus.ok);
default:
return(MailSentStatus.failed);
}
}
});
if (AutoStart)
{
SendMailTask.Start();
}
return(SendMailTask);
}
public Task<MailSentStatus> Send(EMailEnvelop EMailEnvelop,
Byte NumberOfRetries = 3,
Boolean AutoStart = true)
{
var SendMailTask = new Task<MailSentStatus>(() => {
lock (this) {
switch (Connect())
{
case Sockets.TCP.TCPConnectResult.InvalidDomainName:
return MailSentStatus.failed;
case Sockets.TCP.TCPConnectResult.NoIPAddressFound:
return MailSentStatus.failed;
case Sockets.TCP.TCPConnectResult.UnknownError:
return MailSentStatus.failed;
case Sockets.TCP.TCPConnectResult.Ok:
// 220 mail.ahzf.de ESMTP Postfix (Debian/GNU)
var LoginResponse = this.ReadSMTPResponse();
if (LoginResponse.StatusCode != SMTPStatusCode.ServiceReady)
throw new SMTPClientException("SMTP login error: " + LoginResponse.ToString());
switch (LoginResponse.StatusCode)
{
case SMTPStatusCode.ServiceReady:
#region Send EHLO
var EHLOResponses = SendCommandAndWaits("EHLO " + LocalDomain);
// 250-mail.ahzf.de
// 250-PIPELINING
// 250-SIZE 30720000
// 250-VRFY
// 250-ETRN
// 250-STARTTLS
// 250-AUTH LOGIN DIGEST-MD5 PLAIN CRAM-MD5
// 250-AUTH=LOGIN DIGEST-MD5 PLAIN CRAM-MD5
// 250-ENHANCEDSTATUSCODES
// 250-8BITMIME
// 250 DSN
if (EHLOResponses.Any(v => v.StatusCode != SMTPStatusCode.Ok))
{
var Error = EHLOResponses.Where(v => v.StatusCode != SMTPStatusCode.Ok).
FirstOrDefault();
if (Error.StatusCode != SMTPStatusCode.Ok)
throw new SMTPClientException("SMTP EHLO command error: " + Error.ToString());
}
#endregion
#region Check for STARTTLS
if (UseTLS == TLSUsage.STARTTLS)
{
if (EHLOResponses.Any(v => v.Response == "STARTTLS"))
{
var StartTLSResponse = SendCommandAndWait("STARTTLS");
if (StartTLSResponse.StatusCode == SMTPStatusCode.ServiceReady)
EnableTLS();
}
else
throw new Exception("TLS is not supported by the SMTP server!");
// Send EHLO again in order to get the new list of supported extensions!
EHLOResponses = SendCommandAndWaits("EHLO " + LocalDomain);
}
#endregion
#region Analyze EHLO responses and set SMTP capabilities
// 250-mail.ahzf.de
// 250-PIPELINING
// 250-SIZE 30720000
// 250-VRFY
// 250-ETRN
// 250-STARTTLS
// 250-AUTH LOGIN DIGEST-MD5 PLAIN CRAM-MD5
// 250-AUTH=LOGIN DIGEST-MD5 PLAIN CRAM-MD5
// 250-ENHANCEDSTATUSCODES
// 250-8BITMIME
// 250 DSN
var MailServerName = EHLOResponses.FirstOrDefault();
EHLOResponses.Skip(1).ForEach(v => {
#region PIPELINING
if (v.Response == "PIPELINING")
Capabilities |= SmtpCapabilities.Pipelining;
#endregion
#region SIZE
else if (v.Response.StartsWith("SIZE "))
{
Capabilities |= SmtpCapabilities.Size;
if (!UInt64.TryParse(v.Response.Substring(5), out _MaxMailSize))
throw new Exception("Invalid SIZE capability!");
}
#endregion
// else if (v.Response == "VRFY")
// Capabilities |= SmtpCapabilities.;
// else if (v.Response == "ETRN")
// Capabilities |= SmtpCapabilities.;
#region STARTTLS
if (v.Response == "STARTTLS")
Capabilities |= SmtpCapabilities.StartTLS;
#endregion
#region AUTH
else if (v.Response.StartsWith("AUTH "))
{
Capabilities |= SmtpCapabilities.Authentication;
SMTPAuthMethods ParsedAuthMethod;
var AuthType = v.Response.Substring(4, 1);
var AuthMethods = v.Response.Substring(5).Split(' ');
// GMail: "AUTH LOGIN PLAIN XOAUTH XOAUTH2 PLAIN-CLIENTTOKEN"
foreach (var AuthMethod in AuthMethods)
{
if (Enum.TryParse<SMTPAuthMethods>(AuthMethod.Replace('-', '_'), true, out ParsedAuthMethod))
{
if (AuthType == " ")
_AuthMethods |= ParsedAuthMethod;
}
else
_UnknownAuthMethods.Add(AuthMethod);
}
}
#endregion
#region ENHANCEDSTATUSCODES
if (v.Response == "ENHANCEDSTATUSCODES")
Capabilities |= SmtpCapabilities.EnhancedStatusCodes;
#endregion
#region 8BITMIME
if (v.Response == "8BITMIME")
Capabilities |= SmtpCapabilities.EightBitMime;
#endregion
#region DSN
if (v.Response == "DSN")
Capabilities |= SmtpCapabilities.Dsn;
#endregion
#region BINARYMIME
if (v.Response == "BINARYMIME")
Capabilities |= SmtpCapabilities.BinaryMime;
#endregion
#region CHUNKING
if (v.Response == "CHUNKING")
Capabilities |= SmtpCapabilities.Chunking;
#endregion
#region UTF8
if (v.Response == "UTF8")
Capabilities |= SmtpCapabilities.UTF8;
#endregion
});
#endregion
#region Auth PLAIN...
if (_AuthMethods.HasFlag(SMTPAuthMethods.PLAIN))
{
var AuthPLAINResponse = SendCommandAndWait("AUTH PLAIN " +
Convert.ToBase64String(ByteZero.
Concat(_Login. ToUTF8Bytes()).
Concat(ByteZero).
Concat(_Password.ToUTF8Bytes()).
ToArray()));
}
#endregion
#region ...or Auth LOGIN...
else if (_AuthMethods.HasFlag(SMTPAuthMethods.LOGIN))
{
var AuthLOGIN1Response = SendCommandAndWait("AUTH LOGIN");
var AuthLOGIN2Response = SendCommandAndWait(Convert.ToBase64String(_Login. ToUTF8Bytes()));
var AuthLOGIN3Response = SendCommandAndWait(Convert.ToBase64String(_Password.ToUTF8Bytes()));
}
#endregion
#region ...or AUTH CRAM-MD5
else if (_AuthMethods.HasFlag(SMTPAuthMethods.CRAM_MD5))
{
var AuthCRAMMD5Response = SendCommandAndWait("AUTH CRAM-MD5");
if (AuthCRAMMD5Response.StatusCode == SMTPStatusCode.AuthenticationChallenge)
{
var aa = Ext2.CRAM_MD5("<*****@*****.**>",
"tim", "tanstaaftanstaaf");
var a2 = Convert.ToBase64String(aa) == "dGltIGI5MTNhNjAyYzdlZGE3YTQ5NWI0ZTZlNzMzNGQzODkw";
var bb = Ext2.CRAM_MD5("<*****@*****.**>",
"alice", "wonderland");
var b2 = Convert.ToBase64String(bb) == "YWxpY2UgNjRiMmE0M2MxZjZlZDY4MDZhOTgwOTE0ZTIzZTc1ZjA=";
var cc = Ext2.CRAM_MD5("<*****@*****.**>", "ahzf", "ahzf2305!");
var zz = Ext2.CRAM_MD5(Convert.FromBase64String(AuthCRAMMD5Response.Response).ToUTF8String(),
_Login, _Password);
var AuthPLAINResponse = SendCommandAndWait(Convert.ToBase64String(zz));
}
}
#endregion
#region MAIL FROM:
foreach (var MailFrom in EMailEnvelop.MailFrom)
{
// MAIL FROM:<*****@*****.**>
/// 250 2.1.0 Ok
var MailFromCommand = "MAIL FROM: <" + MailFrom.Address.ToString() + ">";
if (Capabilities.HasFlag(SmtpCapabilities.EightBitMime))
MailFromCommand += " BODY=8BITMIME";
else if (Capabilities.HasFlag(SmtpCapabilities.BinaryMime))
MailFromCommand += " BODY=BINARYMIME";
var _MailFromResponse = SendCommandAndWait(MailFromCommand);
if (_MailFromResponse.StatusCode != SMTPStatusCode.Ok)
throw new SMTPClientException("SMTP MAIL FROM command error: " + _MailFromResponse.ToString());
}
#endregion
#region RCPT TO(s):
// RCPT TO:<*****@*****.**>
/// 250 2.1.5 Ok
EMailEnvelop.RcptTo.ForEach(Rcpt => {
var _RcptToResponse = SendCommandAndWait("RCPT TO: <" + Rcpt.Address.ToString() + ">");
switch (_RcptToResponse.StatusCode)
{
case SMTPStatusCode.UserNotLocalWillForward:
case SMTPStatusCode.Ok:
break;
case SMTPStatusCode.UserNotLocalTryAlternatePath:
case SMTPStatusCode.MailboxNameNotAllowed:
case SMTPStatusCode.MailboxUnavailable:
case SMTPStatusCode.MailboxBusy:
// throw new SmtpCommandException(SmtpErrorCode.RecipientNotAccepted, _RcptToResponse.StatusCode, mailbox, _RcptToResponse.Response);
case SMTPStatusCode.AuthenticationRequired:
throw new UnauthorizedAccessException(_RcptToResponse.Response);
//default:
// throw new SmtpCommandException(SmtpErrorCode.UnexpectedStatusCode, _RcptToResponse.StatusCode, _RcptToResponse.Response);
}
//Debug.WriteLine(_RcptToResponse);
});
#endregion
#region Mail DATA
// The encoded MIME text lines must not be longer than 76 characters!
/// 354 End data with <CR><LF>.<CR><LF>
var _DataResponse = SendCommandAndWait("DATA");
if (_DataResponse.StatusCode != SMTPStatusCode.StartMailInput)
throw new SMTPClientException("SMTP DATA command error: " + _DataResponse.ToString());
// Send e-mail headers...
if (EMailEnvelop.Mail != null)
{
EMailEnvelop.Mail.
Header.
Select(header => header.Key + ": " + header.Value).
ForEach(line => SendCommand(line));
//SendCommand("Message-Id: <" + (EMailEnvelop.Mail.MessageId != null
// ? EMailEnvelop.Mail.MessageId.ToString()
// : GenerateMessageId(EMailEnvelop.Mail, RemoteHost).ToString()) + ">");
SendCommand("");
// Send e-mail body(parts)...
//if (EMailEnvelop.Mail.MailBody != null)
//{
EMailEnvelop.Mail.Body.ToText(false).ForEach(line => SendCommand(line));
SendCommand("");
//}
}
else if (EMailEnvelop.Mail.ToText != null)
{
EMailEnvelop.Mail.ToText.ForEach(line => SendCommand(line));
SendCommand("");
}
#endregion
#region End-of-DATA
/// .
/// 250 2.0.0 Ok: queued as 83398728027
var _FinishedResponse = SendCommandAndWait(".");
if (_FinishedResponse.StatusCode != SMTPStatusCode.Ok)
throw new SMTPClientException("SMTP DATA '.' command error: " + _FinishedResponse.ToString());
#endregion
#region QUIT
/// QUIT
/// 221 2.0.0 Bye
var _QuitResponse = SendCommandAndWait("QUIT");
if (_QuitResponse.StatusCode != SMTPStatusCode.ServiceClosingTransmissionChannel)
throw new SMTPClientException("SMTP QUIT command error: " + _QuitResponse.ToString());
#endregion
break;
}
return MailSentStatus.ok;
default:
return MailSentStatus.failed;
}}
});
if (AutoStart)
SendMailTask.Start();
return SendMailTask;
}