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 SendData()
{
IAsyncResult result = DataCommand.BeginSend(_connection, s_sendDataCompleted, this);
if (!result.CompletedSynchronously)
{
return;
}
DataCommand.EndSend(result);
_stream = _connection.GetClosableStream();
if (_failedRecipientExceptions.Count > 1)
{
InvokeCallback(new SmtpFailedRecipientsException(_failedRecipientExceptions, _failedRecipientExceptions.Count == _toCollection.Count));
}
else if (_failedRecipientExceptions.Count == 1)
{
InvokeCallback(_failedRecipientExceptions[0]);
}
else
{
InvokeCallback();
}
}