[courier-users] Re: bounce messages with more than one recipient

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.





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