From: mouss (mlist.onlyfree.fr)
Date: Mon May 28 2007 - 17:06:03 CDT

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Marian Boboc wrote:
> I guess you are right; I might lookup some other ways to avoid these
> inconveniences.
> For a small mail server (personal) I still think it's a good solution to
> avoid all the spam and the unnecessary traffic. Of course is not a solution
> for the big providers, but only for very small systems with the risk of
> losing some mail (you can lose it anyway in the middle of the rubbish mail).
>

"no reason to get excited" (Bob Dylan). start by implementing "common""
safe checks:
- reject non fqdn addresses (both sender and recipient)
- zen.spamhaus.org
- invalid helo
- reject_unknown_sender_domain
- check_sender_mx_access to reject domains with a private IP as MX
- reject helo if it is his IP or his hostname
- reject numeric helo /\-?\d+$/

+ use a spam filter (amavisd-new+spamassassin for instance).
+ possibly use gr(ay|ey|is|ow|uu)listing

this should reduce your spam and help you focus on the spam you miss.

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