On Wednesday, July 16, 2014 10:56:06 Aram J. Agajanian wrote:
> I sent the last message with Geary and something about it seems to have
> triggered the spam filter.
1. Invalid timezone in the Date: field:
Date: Wed, 16 Jul 2014 01:57:33 -0004
that "-0004" isn't a valid timezone. As you're in New York, that
should be "-0400".
2.0 point spam score for this.
2. Sending the mail via an IP address owned by optonline.net directly,
and optonline.net has an SPF record listing who can send email from that
domain, and naturally the IP address used isn't in that list.
0.7 point spam score for this.
Furthermore the IP address on optonline.net is listed in the SpamHaus
PBL list as one that shouldn't be sending unauthenticated email directly
(because it's a dynamic IP address on an ISP connection):
http://www.spamhaus.org/pbl/
3.6 point spam score for this.
And IP address used has a reverse DNS lookup that looks like a dynamic
IP address (because it is)...
0.4 point spam score for that.
Total: 4.7 points for sending email from a dynamic IP address on
optonline.net directly.
3. The HELO/EHLO used in the SMTP session to send the mail is invalid:
Received: from server.localdomain
For Postfix this is usually set in /etc/mailname on Debian-based systems,
or defaults to the FQDN used on the box on other systems.
Surprisingly, SpamAssassin didn't add a score for this, but it probably
should have.
The bottom line is:
- there are a few things in your setup that you can fix that would bring
you just below the 5.0 threshold
- you need to relay your mail through a "real mail server" somewhere if
you want to be able to relay mail reliably.
-- Chris
--
Chris Knadle
[email protected]
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