From: Peer Heinlein (p.heinlein+postfixmailinglisteheinlein-support.de)
Date: Sat Apr 03 2010 - 05:21:21 CDT

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Hi!

Some mailservers close their session immediatley if the client-IP is
listed on RBLs or expected to come from a dynamic IP-range:

peerwaffel:~> telnet 71.74.56.244 25
Trying 71.74.56.244...
Connected to 71.74.56.244.
Escape character is '^]'.
554 5.7.1 - ERROR: Mail refused - <89.204.137.69> - See
http://csi.cloudmark.com/reset-request/
Connection closed by foreign host.
peerwaffel:~>

In that case Postfix keeps his messages in the deferred-Queue even if
the recipients server has sent a 5xx fatal error:

Feb 17 00:55:28 91.198.250.29 postfix/smtp[9073]: 22210F6525:
to=<xxxxxtriad.rr.com>, relay=hrndvasmtpin02.mail.rr.com[71.74.56.244],
delay=1, status=deferred (host hrndva-smtpin02.mail.rr.com[71.74.56.244]
refused to talk to me: 554 5.7.1 - ERROR: Mail refused -
<213.203.238.10> - See http://security.rr.com/cgi-bin/block-lookup?
213.203.238.10)

I don't understand why Postfix does not bounce the message?! It's a
fatal error!

Peer

--
Heinlein Professional Linux Support GmbH
Linux: Akademie - Support - Hosting

http://www.heinlein-support.de
Tel: 030 / 40 50 51 - 0
Fax: 030 / 40 50 51 - 19

Zwangsangaben lt. §35a GmbHG:
HRB 93818 B / Amtsgericht Berlin-Charlottenburg,
Geschäftsführer: Peer Heinlein -- Sitz: Berlin

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