/// <summary>
/// Validates syntax and existence of the given address.
/// </summary>
/// <param name="address">The address to be validated.</param>
/// <param name="dnsServers">Name Servers to be used for MX records search.</param>
/// <returns>True if the address is valid, otherwise false.</returns>
public static bool Validate(string address, ServerCollection dnsServers)
{
if (!ValidateSyntax(address))
{
return(false);
}
else
{
string domain = address.Split('@')[1];
bool result;
SmtpClient smtp = new SmtpClient();
smtp.SendTimeout = 15;
smtp.ReceiveTimeout = 15;
MxRecordCollection mxRecords = new MxRecordCollection();
try
{
#if !PocketPC
mxRecords = GetMxRecords(domain, dnsServers);
#else
mxRecords = ActiveUp.Net.Mail.Validator.GetMxRecords(domain);
#endif
}
catch
{
new Exception("Can't connect to DNS server.");
}
smtp.Connect(mxRecords.GetPrefered().Exchange);
try
{
smtp.Ehlo(System.Net.Dns.GetHostName());
}
catch
{
smtp.Helo(System.Net.Dns.GetHostName());
}
if (smtp.Verify(address))
{
result = true;
}
else
{
try
{
//smtp.MailFrom("postmaster@"+System.Net.Dns.GetHostName());
//smtp.MailFrom("*****@*****.**");
smtp.MailFrom("postmaster@" + domain);
smtp.RcptTo(address);
result = true;
}
catch
{
result = false;
}
}
smtp.Disconnect();
return(result);
}
}
/// <summary>
/// Get the MX records for the specified domain name using the specified DNS server.
/// </summary>
/// <param name="address">The domain name.</param>
/// <param name="host">The host name of the DNS server to use.</param>
/// <param name="port">The port number of the DNS server to use.</param>
/// <param name="timeout">The timeout in miliseconds.</param>
/// <returns>A collection of Mx Records.</returns>
public static MxRecordCollection GetMxRecords(string address, string host, int port, int timeout)
{
var mxRecords = new MxRecordCollection();
var query = new DnsQuery(IPAddress.Parse(host))
{
RecursiveQuery = true,
DnsServer = { Port = port },
Domain = address
};
DnsAnswer answer = query.QueryServer(RecordType.MX, timeout);
foreach (Answer entry in answer.Answers)
{
var mxRecord = (MXRecord)entry.Data;
mxRecords.Add(mxRecord.Domain, mxRecord.Preference);
}
return(mxRecords);
}
/// <summary>
/// Get the MX records for the specified domain name using the specified DNS server.
/// </summary>
/// <param name="address">The domain name.</param>
/// <param name="host">The host name of the DNS server to use.</param>
/// <param name="port">The port number of the DNS server to use.</param>
/// <param name="timeout">The timeout in miliseconds.</param>
/// <returns>A collection of Mx Records.</returns>
public static ActiveUp.Net.Mail.MxRecordCollection GetMxRecords(string address, string host, int port, int timeout)
{
MxRecordCollection mxRecords = new MxRecordCollection();
DnsQuery query = new DnsQuery(IPAddress.Parse(host));
query.RecursiveQuery = true;
query.DnsServer.Port = port;
query.Domain = address;
DnsAnswer answer = query.QueryServer(RecordType.MX, timeout);
foreach (DnsEntry entry in answer.Answers)
{
MXRecord mxRecord = (MXRecord)entry.Data;
mxRecords.Add(mxRecord.Domain, mxRecord.Preference);
}
return(mxRecords);
}
/// <summary>
/// Get the MX records for the specified domain name using the specified DNS server.
/// </summary>
/// <param name="address">The domain name.</param>
/// <param name="host">The host name of the DNS server to use.</param>
/// <param name="port">The port number of the DNS server to use.</param>
/// <param name="timeout">The timeout in miliseconds.</param>
/// <returns>A collection of Mx Records.</returns>
public static ActiveUp.Net.Mail.MxRecordCollection GetMxRecords(string address, string host, int port, int timeout)
{
MxRecordCollection mxRecords = new MxRecordCollection();
DnsQuery query = new DnsQuery(IPAddress.Parse(host));
query.RecursiveQuery = true;
query.DnsServer.Port = port;
query.Domain = address;
DnsAnswer answer = query.QueryServer(RecordType.MX, timeout);
foreach (DnsEntry entry in answer.Answers)
{
MXRecord mxRecord = (MXRecord)entry.Data;
mxRecords.Add(mxRecord.Domain, mxRecord.Preference);
}
return mxRecords;
}
/// <summary>
/// Validates syntax and existence of the given address.
/// </summary>
/// <param name="address">The address to be validated.</param>
/// <returns>True if the address is valid, otherwise false.</returns>
public static bool Validate(string address)
{
if (!ValidateSyntax(address))
{
return(false);
}
else
{
try
{
string domain = address.Split('@')[1];
bool result;
SmtpClient smtp = new SmtpClient();
smtp.SendTimeout = 0;
smtp.ReceiveTimeout = 0;
MxRecordCollection mxRecords = new MxRecordCollection();
try
{
mxRecords = GetMxRecords(domain);
}
catch
{
new Exception("Can't connect to DNS server.");
}
//Console.WriteLine(mxRecords.GetPrefered().Exchange);
if (mxRecords.Count > 0)
{
smtp.Connect(mxRecords.GetPrefered().Exchange);
}
else
{
return(false);
}
try
{
smtp.Ehlo(System.Net.Dns.GetHostName());
}
catch
{
smtp.Helo(System.Net.Dns.GetHostName());
}
if (smtp.Verify(address))
{
result = true;
}
else
{
try
{
//smtp.MailFrom("postmaster@"+System.Net.Dns.GetHostName());
//smtp.MailFrom("*****@*****.**");
smtp.MailFrom("postmaster@" + domain);
smtp.RcptTo(address);
result = true;
}
catch (Exception ex)
{
#if (DEBUG)
Console.WriteLine(ex.ToString());
#endif
#if !PocketPC
HttpContext.Current.Trace.Write("ActiveMail", ex.ToString());
#endif
result = false;
}
}
smtp.Disconnect();
return(result);
}
catch
{
return(false);
}
}
}
/// <summary>
/// Validates syntax and existence of the given address.
/// </summary>
/// <param name="address">The address to be validated.</param>
/// <returns>True if the address is valid, otherwise false.</returns>
public static bool Validate(string address)
{
if (!ActiveUp.Net.Mail.Validator.ValidateSyntax(address)) return false;
else
{
try
{
string domain = address.Split('@')[1];
bool result;
ActiveUp.Net.Mail.SmtpClient smtp = new ActiveUp.Net.Mail.SmtpClient();
smtp.SendTimeout = 0;
smtp.ReceiveTimeout = 0;
MxRecordCollection mxRecords = new MxRecordCollection();
try
{
mxRecords = ActiveUp.Net.Mail.Validator.GetMxRecords(domain);
}
catch
{
new System.Exception("Can't connect to DNS server.");
}
//Console.WriteLine(mxRecords.GetPrefered().Exchange);
if (mxRecords.Count > 0) smtp.Connect(mxRecords.GetPrefered().Exchange);
else return false;
try
{
smtp.Ehlo(System.Net.Dns.GetHostName());
}
catch
{
smtp.Helo(System.Net.Dns.GetHostName());
}
if (smtp.Verify(address)) result = true;
else
{
try
{
//smtp.MailFrom("postmaster@"+System.Net.Dns.GetHostName());
//smtp.MailFrom("*****@*****.**");
smtp.MailFrom("postmaster@" + domain);
smtp.RcptTo(address);
result = true;
}
catch (Exception ex)
{
System.Console.WriteLine(ex.ToString());
#if !PocketPC
System.Web.HttpContext.Current.Trace.Write("ActiveMail", ex.ToString());
#endif
result = false;
}
}
smtp.Disconnect();
return result;
}
catch
{
return false;
}
}
}
/// <summary>
/// Validates syntax and existence of the given address.
/// </summary>
/// <param name="address">The address to be validated.</param>
/// <param name="dnsServers">Name Servers to be used for MX records search.</param>
/// <returns>True if the address is valid, otherwise false.</returns>
public static bool Validate(string address, ServerCollection dnsServers)
{
if (!ActiveUp.Net.Mail.Validator.ValidateSyntax(address)) return false;
else
{
string domain = address.Split('@')[1];
bool result;
ActiveUp.Net.Mail.SmtpClient smtp = new ActiveUp.Net.Mail.SmtpClient();
smtp.SendTimeout = 15;
smtp.ReceiveTimeout = 15;
MxRecordCollection mxRecords = new MxRecordCollection();
try
{
#if !PocketPC
mxRecords = ActiveUp.Net.Mail.Validator.GetMxRecords(domain, dnsServers);
#else
mxRecords = ActiveUp.Net.Mail.Validator.GetMxRecords(domain);
#endif
}
catch
{
new System.Exception("Can't connect to DNS server.");
}
smtp.Connect(mxRecords.GetPrefered().Exchange);
try
{
smtp.Ehlo(System.Net.Dns.GetHostName());
}
catch
{
smtp.Helo(System.Net.Dns.GetHostName());
}
if (smtp.Verify(address)) result = true;
else
{
try
{
//smtp.MailFrom("postmaster@"+System.Net.Dns.GetHostName());
//smtp.MailFrom("*****@*****.**");
smtp.MailFrom("postmaster@" + domain);
smtp.RcptTo(address);
result = true;
}
catch
{
result = false;
}
}
smtp.Disconnect();
return result;
}
}