See comment 4 on https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6645

Short description:
If qmail-scanner is used on a mail relay and inserts a received-line like

Received: from xxx.xxx.xxx.xxx (user1@domain.lo...@xxx.xxx.xxx.xxx) by
firstmailserver (envelope-from <user1@domain.local>, uid 201) with
qmail-scanner-2.08st
...

in front of netqmail's line

Received: from unknown (HELO ?127.0.0.1?)
(user1@domain.lo...@xxx.xxx.xxx.xxx)
  by 0 with ESMTPA; 29 Apr 2011 18:23:53 -0000

this causes spamassassin on the target to not understand that the
connection was authenticated, to check a dial-up IP against the PBL and
RBL causing penalty scores and rejection of legitimate mails. I'm unsure
whether this header also causes trouble with some other (proprietary) spam
filtering systems, but unfortunately the admins of those servers are not
flexible enough to check this.

If possible qmail-scanner should append "with ESTMPA" to its received-line
when the connection was authenticated to prevent such issues.


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