The original message was received at Mon, 10 Dec 2007 16:30:49 +0100 (CET) from localhost [127.0.0.1] ----- The following addresses had permanent fatal errors ----- <[email protected]> (reason: 550-Callout verification failed:) ----- Transcript of session follows ----- ... while talking to mail-gw.ise.fraunhofer.de.:

...

...

DATA <<< 550-Callout verification failed: <<< 550 550 Unknown user: solar-energyd 550 5.1.1 <[email protected]>... User unknown <<< 503 valid RCPT command must precede DATA