[PLUG] Mail Administration Question

[Roderick Anderson]

Rich,

If you are running Postfix I strongly suggest running Postgrey or other 
greylisting software.

I saw a 90%+ drop in incoming spam about one day after it was fired up 
(5+ years ago).  This was for around 200 domains.  I have had to 
whitelist a few incoming domains but the stock 'white-list' that comes 
with the install handles the big ones.

This is on about 8 MX servers.  The accepted mail is delivered to the 
actual domain's mail server where spam filtering knocks out most of the 
rest.

YMMV


Rod
-- 
On 04/06/2015 08:10 AM, Rich Shepard wrote:
>     Much spam passing current postfix UCE filters and landing in the INBOX are
> from IP addresses that do not resolve to a domain name. The headers include
> a 'Received: from <some_domain_name> (unknown [nnn.ooo.ppp.qqq])'.
>
>     Is the unknown IP address a reliable indicator of spam? A Web search did
> not answer this question. One hit, to an Apple mail forum, suggested that it
> can be the result of some (many?) Mac admins not correctly configuring their
> DNS servers.
>
>     Might adding a rule to reject unknown IP addresses produce unintended
> consequences of rejecting legitimate non-maillist messages?
>
> Rich
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