false positives with IMP

[Iain Pople <ia...@webcentre.unimelb.edu.au>]

Hi,

If I send an email from IMP the headers it inserts can cause problems
with spamassassin and dialup blocking lists.

e.g.

Received: from CPE-203-45-11-59.vic.bigpond.net.au
(CPE-203-45-11-59.vic.bigpond.net.au [203.45.11.59])
	by webmail.brunny.com (IMP) with HTTP
	for <ia...@localhost>; Sun, 24 Oct 2004 10:21:07 +1000

It is inserting a header with the IP address of the computer sending the
email from IMP. The problem is that often this computer is on a dynamic
IP or dialup connection so listed in various blocking lists. This
results in triggering some of the spam assasin rules:

X-Spam-Status: No, hits=0.3 tagged_above=-99.0 required=5.5 tests=AWL,
	BAYES_00, HELO_DYNAMIC_DHCP, HELO_DYNAMIC_IPADDR, NO_REAL_NAME,
	RCVD_IN_NJABL_DUL

This has caused several legitimate messages to be tagged as spam.

I notice that if i use a SMTP client instead (e.g. thunderbird), the
headers are slightly different:

Received: from cpe-203-45-11-59.vic.bigpond.net.au ([203.45.11.59]) by
bwmam09.bigpond.com(MAM REL_3_4_2a 138/139363271) with SMTP id
139363271; Sun, 31 Oct 2004 14:35:01 +1000

This doesn't trigger any spam assassin rules.

Is this a peculiarity of IMP? Is there some way i can avoid this happening?

thanks, Iain.