private void SendMailCallback(IAsyncResult result)
{
try
{
_writer = _transport.EndSendMail(result);
// If some recipients failed but not others, send the e-mail anyway, but then return the
// "Non-fatal" exception reporting the failures. The sync code path does it this way.
// Fatal exceptions would have thrown above at transport.EndSendMail(...)
SendMailAsyncResult sendResult = (SendMailAsyncResult)result;
// Save these and throw them later in SendMessageCallback, after the message has sent.
_failedRecipientException = sendResult.GetFailedRecipientException();
}
catch (Exception e)
{
Complete(e, result);
return;
}
try
{
if (_cancelled)
{
Complete(null, result);
}
else
{
_message !.BeginSend(_writer, DeliveryMethod != SmtpDeliveryMethod.Network,
IsUnicodeSupported(), new AsyncCallback(SendMessageCallback), result.AsyncState !);
}
}
catch (Exception e)
{
Complete(e, result);
}
}
public SmtpFailedRecipientsException(string?message, Exception?innerException) : base(message, innerException)
{
SmtpFailedRecipientException?smtpException = innerException as SmtpFailedRecipientException;
_innerExceptions = smtpException == null?Array.Empty <SmtpFailedRecipientException>() : new SmtpFailedRecipientException[]
{
smtpException
};
}
internal MailWriter SendMail(MailAddress sender, MailAddressCollection recipients, string deliveryNotify,
bool allowUnicode, out SmtpFailedRecipientException?exception)
{
if (sender == null)
{
throw new ArgumentNullException(nameof(sender));
}
if (recipients == null)
{
throw new ArgumentNullException(nameof(recipients));
}
MailCommand.Send(_connection !, SmtpCommands.Mail, sender, allowUnicode);
_failedRecipientExceptions.Clear();
exception = null;
string response;
foreach (MailAddress address in recipients)
{
string smtpAddress = address.GetSmtpAddress(allowUnicode);
string to = smtpAddress + (_connection !.DSNEnabled ? deliveryNotify : string.Empty);
if (!RecipientCommand.Send(_connection, to, out response))
{
_failedRecipientExceptions.Add(
new SmtpFailedRecipientException(_connection.Reader !.StatusCode, smtpAddress, response));
}
}
if (_failedRecipientExceptions.Count > 0)
{
if (_failedRecipientExceptions.Count == 1)
{
exception = _failedRecipientExceptions[0];
}
else
{
exception = new SmtpFailedRecipientsException(_failedRecipientExceptions, _failedRecipientExceptions.Count == recipients.Count);
}
if (_failedRecipientExceptions.Count == recipients.Count)
{
exception.fatal = true;
throw exception;
}
}
DataCommand.Send(_connection !);
return(new MailWriter(_connection !.GetClosableStream(), encodeForTransport: true));
}
public void Send(MailMessage message)
{
ObjectDisposedException.ThrowIf(_disposed, this);
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Info(this, $"DeliveryMethod={DeliveryMethod}");
NetEventSource.Associate(this, message);
}
SmtpFailedRecipientException?recipientException = null;
if (InCall)
{
throw new InvalidOperationException(SR.net_inasync);
}
if (message == null)
{
throw new ArgumentNullException(nameof(message));
}
if (DeliveryMethod == SmtpDeliveryMethod.Network)
{
CheckHostAndPort();
}
MailAddressCollection recipients = new MailAddressCollection();
if (message.From == null)
{
throw new InvalidOperationException(SR.SmtpFromRequired);
}
if (message.To != null)
{
foreach (MailAddress address in message.To)
{
recipients.Add(address);
}
}
if (message.Bcc != null)
{
foreach (MailAddress address in message.Bcc)
{
recipients.Add(address);
}
}
if (message.CC != null)
{
foreach (MailAddress address in message.CC)
{
recipients.Add(address);
}
}
if (recipients.Count == 0)
{
throw new InvalidOperationException(SR.SmtpRecipientRequired);
}
_transport.IdentityRequired = false; // everything completes on the same thread.
try
{
InCall = true;
_timedOut = false;
_timer = new Timer(new TimerCallback(TimeOutCallback), null, Timeout, Timeout);
bool allowUnicode = false;
string?pickupDirectory = PickupDirectoryLocation;
MailWriter writer;
switch (DeliveryMethod)
{
case SmtpDeliveryMethod.PickupDirectoryFromIis:
throw new NotSupportedException(SR.SmtpGetIisPickupDirectoryNotSupported);
case SmtpDeliveryMethod.SpecifiedPickupDirectory:
if (EnableSsl)
{
throw new SmtpException(SR.SmtpPickupDirectoryDoesnotSupportSsl);
}
allowUnicode = IsUnicodeSupported(); // Determined by the DeliveryFormat parameter
ValidateUnicodeRequirement(message, recipients, allowUnicode);
writer = GetFileMailWriter(pickupDirectory);
break;
case SmtpDeliveryMethod.Network:
default:
GetConnection();
// Detected during GetConnection(), restrictable using the DeliveryFormat parameter
allowUnicode = IsUnicodeSupported();
ValidateUnicodeRequirement(message, recipients, allowUnicode);
writer = _transport.SendMail(message.Sender ?? message.From, recipients,
message.BuildDeliveryStatusNotificationString(), allowUnicode, out recipientException);
break;
}
_message = message;
message.Send(writer, DeliveryMethod != SmtpDeliveryMethod.Network, allowUnicode);
writer.Close();
//throw if we couldn't send to any of the recipients
if (DeliveryMethod == SmtpDeliveryMethod.Network && recipientException != null)
{
throw recipientException;
}
}
catch (Exception e)
{
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(this, e);
}
if (e is SmtpFailedRecipientException && !((SmtpFailedRecipientException)e).fatal)
{
throw;
}
Abort();
if (_timedOut)
{
throw new SmtpException(SR.net_timeout);
}
if (e is SecurityException ||
e is AuthenticationException ||
e is SmtpException)
{
throw;
}
throw new SmtpException(SR.SmtpSendMailFailure, e);
}
finally
{
InCall = false;
if (_timer != null)
{
_timer.Dispose();
}
}
}