SmtpClient.SendAsync() does not work anymore

Question

Hi All,

I have recently purchased a new computer, and now my e-mails never get sent, and there are NEVER any exceptions thrown or anything.

Can somebody please provide some samples that work using the SmtpClient class? Any help at all will be greatly appreciated.

Thank you

Updates

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Ok - I have added credentials now. And can SUCCESSFULLY SEND e-mail synchronously. But I can still not send them asynchronously.

Old: After trying to send e-mail synchronously, I receive the following exception:

Transaction failed. The server response was:

5.7.1 <[email protected]>: Relay access denied.

Answer 1

You could first try the synchronous Send method to verify that everything is setup correctly with the SMTP server and that you don't get any exceptions:

var client = new SmtpClient("smtp.somehost.com");
var message = new MailMessage();
message.From = new MailAddress("[email protected]");
message.To.Add(new MailAddress("[email protected]"));
message.Subject = "test";
message.Body = "test body";
client.Send(message);

Remark: In .NET 4 SmtpClient implements IDisposable so make sure you wrap it in a using statement.