>> SquirrelMail stable adds both headers in order to avoid triggering this
>> SA
>> error. SquirrelMail devel adds only User-Agent:.
>
> But I'm using SquirrelMail stable 1.4.2.

X-Mailer was added after 1.4.2 release. You can compare dates on cvs. file
tagged with "rel-1_4_2" has version 1.18.2.4. X-Mailer was added in
1.18.2.5

If you want to solve it - compare rules/20_head_tests.cf file in SA 2.63
and 3.0.0cvs. http://bugzilla.spamassassin.org/show_bug.cgi?id=2809

Entire fix takes only one new and one changed line. SquirrelMail is not
broken. You can get same results, if you use Mozilla Thunderbird.

>> If 65.92.117.21 is your server's address - you are running smtp server
>> in
>> dialup/broadband ip range. Some servers will block you even without
>> SpamAssassin.
>
> That IP was my local connection IP, the IP I was dynamically assigned when
> I connected to my ISP yesterday. So, my PC was using that IP, but the SMTP
> server at my web host had a different IP. Perhaps some other customer of
> my ISP had used that IP for spamming, so perhaps it's now on a blacklist.

Dynablocks list dynamic addresses. Entire sympatico.ca dialup subnet is
listed.

In most of the cases address is not used by spammers. Dynamic address
should not run SMTP servers. RBLs that list dynamic address can help in
sorting spammers and infected computers that use broadband access, if you
use them at smtp level. Assigning high SA scores to dynamic addresses
might be bad policy, because these addresses can be legit mailers using
default provider's SMTP server.

http://www.dnsstuff.com/tools/ip4r.ch?ip=65.92.117.21

If you want, you can remove or rename that received: header in
squirrelmail. Check lines 262-265 in class/deliver/Deliver.class.php

My suggestion: keep that line. It provides information that can't be
forged by your webmail users. Explain SpamAssassin users about high scores
assigned to any dynamic addresses. 6.1 score is bigger that default spam
treshhold and both tests state the same thing. Dynablocks should be
blocked at smtp level. Rename that line to X-Received: only if you have to
live with SA users that refuse to lower dynablock RBL scores.

-- 
Tomas


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