Ignore the 'm12si18241592qcu.131' -- that's just the ID that Google is using to identify the SMTP session. It looks to me like they're returning the 5.5.1 in response to the 'DATA' command: > ----- Transcript of session follows ----- > ... while talking to alt1.aspmx.l.google.com.: > >>> DATA > <<< 502 5.5.1 Unrecognized command. m12si18241592qcu.131 Of course, DATA is a valid SMTP command, so I can only speculate what might be 'unrecognized' about it. Maybe some non-printable character ended up in the data stream? Since you're a Google customer, you probably need to give them the transcript above. Hopefully they still have old enough log data to find the m12si18241592qcu.131 thread and see why the transaction failed. -- Liam Kelly Senior Consulting Analyst L-Soft international [log in to unmask] Read news, tips, and other information in our 'LISTSERV at Work' archives at <http://www.lsoft.com/news/newsletter-us.asp> ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa.exe?SUBED1=LSTSRV-L&A=1