1 message in net.sourceforge.lists.courier-users[courier-users] Re: bounce messages w...
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TrevMay 24, 2005 8:04 pm 
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Subject:[courier-users] Re: bounce messages with more than one recipientActions...
From:Trev (45@Safe-mail.net)
Date:May 24, 2005 8:04:47 pm
List:net.sourceforge.lists.courier-users

Ricardo Kleemann wrote:

I'm seeing some error messages in my maillog which say "550 sorry, I don't accept bounce messages with more than one recipient. Go read RFC2821."

What exactly does that mean?

It sounds like the SMTP client requested not to receive any bounces (i.e. it specified a null reverse-path in the MAIL command). I don't believe RFC 2821 actually forbids that behavior. But the decision to reject such messages has a low risk of false positives, because legitimate senders nearly always specify a non-null reverse-path whenever the RFC allows. In particular, legitimate mailing list operators always specify a valid non-null reverse-path, because they want to receive bounces, so they can auto-unsubscribe any subscribers who no longer exist.