From: Wietse Venema (wietseporcupine.org)
Date: Thu Jan 12 2006 - 07:18:53 CST

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Matthias Andree:
> Mezei Zolt_n <mezei.zoltantelefor.hu> writes:
>
> > However when receiving mail from some mail servers, they just wasn't
> > delivered. I finally solved the problem, and here is the description, it
> > may be useful.
> >
> > The SMTP chat begun correctly, EHLO, MAIL FROM and RCPT TO was sent and
> > answered. After that postfix received DATA and answered
> >
> > "354 End data with <CR><LF>.<CR><LF>"
> >
> > No answers came after that, and the TCP package was repeated many times,
> > before the 5 mins timeout exceeded. After that the DATA transfer ended
> > without success.
>
> ...
>
> > After hours of trying I found out that changing the 354 message to:
> >
> > "354 Start mail input; end with <CRLF>.<CRLF>"
> >
> > solves the problem. This is the exact recommendation from the RFC.

Kewl. You might want to test if the firewall recognizes this
magic string in other contexts as well.

There is precedent. Firewall-1 would recognize the PORT command
(from the FTP protocol) in non-FTP contexts and open up an inbound
channel on demand.

        Wietse

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