From: Wietse Venema (wietseporcupine.org)
Date: Tue Jun 22 2004 - 12:41:32 CDT

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Kenn Murrah:
> I'm not absolutely sure this is a postfix question -- my apologies if it isn't ....
>
> I've just had mail returned from a known valid address ... my postfix reported the following:
>
>
> This is the Postfix program at host <snip>.
> >
> >I'm sorry to have to inform you that the message returned
> >below could not be delivered to one or more destinations.
> >
> >For further assistance, please send mail to <postmaster>
> >
> >If you do so, please include this problem report. You can
> >delete your own text from the message returned below.
> >
> > The Postfix program
> >
> ><bryanpeterson.com>: host mail.peterson.com[216.138.119.9] said: 250 ok

Later Postfix versions will also tell you that this was in response
to the DATA command, where a 250 reply is out-of-protocol.

The server should have replied with 351 or 5XX.

The problem is that mail.peterson.com runs qmail, so no-one knows
how many patches it has been subjected to.

If this is a persistent condition, only a recording of the SMTP
session can demonstrate what system is at fault.

        Wietse

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