[Mailman-Users] Rejected or bounced messages.

Joseph Brennan brennan at columbia.edu
Wed Jan 1 23:33:20 CET 2014

These three were stopped after RCPT, so the problem is not about content. 
Most likely the recipient address is not deliverable.

<mail at me.com>: host mx6.me.com.akadns.net[] said: 550
   5.1.1 unknown or illegal alias: username at me.com (in reply to RCPT
   TO command)

<mail at cgocable.ca>: host mx2.cgocable.ca[] said: 550 #5.1.0
   Address rejected. (in reply to RCPT TO command)

<mail at msn.com>: host mx2.hotmail.com[] said: 550 Requested
   action not taken: mailbox unavailable (in reply to RCPT TO command)

The first one is the unusual case.

<mail at epdot.com>: host mx1.megamailservers.com[] said: 550
   5.7.1 s01D0qcI004613 This message does not comply with required 
   (in reply to end of DATA command)

I've never seen this error before.

Google "This message does not comply with required standards" to find a lot 
of people speculating about what it means, going back to 2006. They all 
relate it to Exchange or Outlook, but mx1.megamailservers.com says it is 
running Sendmail 8.13.6, and this is not a standard sendmail error message. 
So it's a custom filter on megamailservers.com.

Here's an example involving Mailman and megamailservers.com from 2007!
... with complete message attached. I don't see anything wrong with it.

Joseph Brennan
Columbia University IT

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