System.Net.Mail.SmtpException: Service not available, closing transmission channel. The server response was: 4.4.2
Solution 1
Disposing the smtpclient (objCompose) did the trick.
// Summary:
// Sends a QUIT message to the SMTP server, gracefully ends the TCP connection,
// and releases all resources used by the current instance of the System.Net.Mail.SmtpClient
// class.
public void Dispose();
Solution 2
I like wrapping it in a using block. That'll force the dispose and it's very elegant.
using(SmtpClient objCompose = new SmtpClient("xxxx"))
{
objCompose.Send(mailmessage);
}
rockin'
Updated on February 16, 2020Comments
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rockin' over 4 years
I get this error when I'm frequently sending some e-mail to a list of users. Say it sends 10 mails and 1 gives an error, then sends a couple more mails and gives the same error.
The code looks like this:
public static bool SendEmail(string toMail, string fromname, string from, string subject, string body, string BCC) { MailMessage mailmessage = new MailMessage("[email protected]", toMail, subject, body); mailmessage.IsBodyHtml = true; mailmessage.BodyEncoding = Encoding.GetEncoding(1254); mailmessage.SubjectEncoding = Encoding.GetEncoding(1254); SmtpClient objCompose = new SmtpClient("xxxx"); try { objCompose.Send(mailmessage); return true; } catch (Exception ex) { } return false; }
And the error I get is this:
System.Net.Mail.SmtpException: Service not available, closing transmission channel. The server response was: 4.4.2 mailer.mailer.com Error: timeout exceeded at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message)
can anyone please help, this bug is killing me.
Thanks in advance.
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garik about 12 yearsMailMessage.Dispose() (.NET 3.5)
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Ian Warburton over 11 yearsDidn't work for me. Well... it got rid of the exception but now it just hangs when one sends an email or two.
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nsimeonov over 9 yearsThis code compiles just fine under VS 2013, .NET 4.5