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()));
}
private void SendToCollection()
{
while (_toIndex < _toCollection.Count)
{
MultiAsyncResult result = (MultiAsyncResult)RecipientCommand.BeginSend(_connection,
_toCollection[_toIndex++].GetSmtpAddress(_allowUnicode) + _deliveryNotify,
s_sendToCollectionCompleted, this);
if (!result.CompletedSynchronously)
{
return;
}
string response;
if (!RecipientCommand.EndSend(result, out response))
{
_failedRecipientExceptions.Add(new SmtpFailedRecipientException(_connection.Reader.StatusCode,
_toCollection[_toIndex - 1].GetSmtpAddress(_allowUnicode), response));
}
}
SendData();
}
private static void SendToCollectionCompleted(IAsyncResult result)
{
if (!result.CompletedSynchronously)
{
SendMailAsyncResult thisPtr = (SendMailAsyncResult)result.AsyncState;
try
{
string response;
if (!RecipientCommand.EndSend(result, out response))
{
thisPtr._failedRecipientExceptions.Add(
new SmtpFailedRecipientException(thisPtr._connection.Reader.StatusCode,
thisPtr._toCollection[thisPtr._toIndex - 1].GetSmtpAddress(thisPtr._allowUnicode),
response));
if (thisPtr._failedRecipientExceptions.Count == thisPtr._toCollection.Count)
{
SmtpFailedRecipientException exception = null;
if (thisPtr._toCollection.Count == 1)
{
exception = (SmtpFailedRecipientException)thisPtr._failedRecipientExceptions[0];
}
else
{
exception = new SmtpFailedRecipientsException(thisPtr._failedRecipientExceptions, true);
}
exception.fatal = true;
thisPtr.InvokeCallback(exception);
return;
}
}
thisPtr.SendToCollection();
}
catch (Exception e)
{
thisPtr.InvokeCallback(e);
}
}
}