502 Error: Command Not Implemented

[icartmanxx]

Receiving the above error when trying to send email to a user at a particular domain. We have been able to send to them in the past without difficulty and are not sure why we no longer can. I have checked Event Viewer and I can see our server make a connection to their's but it doesn't give any more info. I also tried setting SMTP Logging to Maximum and reading the LOG files in the IMCDATA\LOGS folder but it doesn't tell me anything...it just shows a connection from our server to theirs that was successful.

Any feedback would be appreciated.

 

[cmeagan656]

Has the user and/or domain that you're trying to send to have a new spam filter? Since the connection is being made by your server it sounds like something, most likely a spam filter, on the recipients side is blocking the email.

Cheers.

 

[icartmanxx]

Not sure about that. I turned my SMTP logging level up to see if I could tell what is happening and the output it listed below. I still don't understand what is causing this error. Any ideas would be appreciated.

3/10/06 10:10:32 AM : A connection to 213.206.137.198 was established.
3/10/06 10:10:33 AM : <<< 220 mail8-lon.xxx.com ESMTP Postfix EGGS and Butter
3/10/06 10:10:33 AM : >>> EHLO server.na.yyy.com

3/10/06 10:10:33 AM : <<< 250-mail8-lon.xxx.com
250-PIPELINING
250-SIZE 150000000
250-ETRN
250-STARTTLS
250 8BITMIME

3/10/06 10:10:33 AM : >>> MAIL FROM:<username1@na.yyy.com> SIZE=4318

3/10/06 10:10:33 AM : <<< 250 Ok
3/10/06 10:10:33 AM : >>> RCPT TO:<username2@xxx.com>

3/10/06 10:10:33 AM : <<< 250 Ok
3/10/06 10:10:33 AM : >>> DATA

3/10/06 10:10:33 AM : <<< 354 Ok
3/10/06 10:10:33 AM : <<< 502 Error: command not implemented
3/10/06 10:10:33 AM : >>> QUIT