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Weird mailman.SendEmail error: "250 2.1.0 Sender OK"

Oct 08 '13 at 11:45

In conjunction with Microsoft Exchange we have a weird failure (every time) of mailman.SendEmail: The function returns false and the SmtpSessionLog ends with a totally correct "250 2.1.0 Sender OK":

220 Microsoft ESMTP MAIL Service ready at Tue, 8 Oct 2013 12:05:57 +0200 EHLO HERKULES Hello [] 250-SIZE 104857600 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-AUTH 250-8BITMIME 250-BINARYMIME 250 CHUNKING MAIL 250 2.1.0 Sender OK

Any idea why that response to MAIL FROM is considered wrong?

Best regards,



Please post the contents of the mailman.LastErrorText for the SendEmail method call. If using an older version of Chilkat, 9 times out of 10 the problem has already been fixed..