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My outbound, internet emails are being marked as spam / being rejected by numerous mailservers - here's an example header:

Received: (qmail 24922 invoked by uid 1004); 23 Mar 2006 20:10:45 -0000
Received: from unknown (HELO mail.company.com) (195.54.229.58)
by gawab.com with SMTP; 23 Mar 2006 20:10:45 -0000
X-Trusted: Blacklisted
Received: from mail.gutrecords.com (localhost.localdomain [127.0.0.1])
by mail.company.com (8.13.4/8.13.4/SuSE Linux 0.7) with ESMTP id k2NJQ2o7006421
for <jreeves@tohere.com>; Thu, 23 Mar 2006 19:26:05 GMT
Received: from mail.company.com (root@localhost)
by mail.company.com (8.13.4/8.13.4/Submit) with ESMTP id k2NJQ28p006420
for <jreeves@tohere.com>; Thu, 23 Mar 2006 19:26:02 GMT
Received: from mail.company.com (mail.company.com 192.168.0.29)
by mail.company.com (Scalix SMTP Relay 10.0.0.175)
via ESMTP; Thu, 23 Mar 2006 19:26:02 +0000 (GMT)
Date: Thu, 23 Mar 2006 19:25:59 +0000

I am presuming that sendmail is misconfigured somewhere? Any pointers would be greatly appreciated.

Thanks
jonny.

nslookup shows...

# nslookup -sil 195.54.229.58
Server: 10.17.112.100
Address: 10.17.112.100#53

Non-authoritative answer:
58.229.54.195.in-addr.arpa name = adsl-58.cust.atlas.net.uk.

Authoritative answers can be found from:

Many mail hosts will reject your mailer if they encounter a non-authoritative answer on reverse dns lookups.

Have a look at this post...

http://www.scalix.com/community/viewtopic.php?t=1695&highlight=blacklist

Regards,
Don

... and a non-authoritative response is often a result of a misconfigured name server.

However, I'm not convinced that's the problem in this case, Don, I don't suppose 10.17.112.100 is authoritative for any external IP address :-)

However, since 195.54.229.58 appears to be an ADSL IP address it may be being treated as a portable IP address (ie non-static) -- your ISP might know. You could also try configuring a smarthost on "mail.company.com" to send all mail to the mail server that your ISP provides (probably something like smtp.atlas.co.uk but I've not been able to guess the name).

jch