On Tue, 2008-11-18 at 17:22 +0000, Steve Kemp wrote:
> Other tests that are good for rejection:
>
> * Bogus Message-IDs.
> (Validate the header is present and you're 99% of the way there.)
Message-ID is not a required header, this will lose legitimate mail.
> * Dialup range restrictions .
> (Guess you've got that covered already via DNSRBL)
>
> * Early-talker
> (Machines that send conversation before waiting for the banner.)
>
> * Make sure there is a Date: header.
> (I do range testing on that; but many spam mails don't have it
> c.f. message-id:)
the Date: header *is* mandatory, so this is fine :-)
> * HELO checks
> (I mostly look for helo $my_IP)
unqualified addresses (no dots) are illegal, and stop a lot of broken
spam software. bare IP addresses likewise, they need to be in brackets,
e.g, "EHLO [10.20.30.40]".
--
regards, | Redpill _
Kjetil T. Homme | Linpro (_)
