On Tue, Oct 07, 2008 at 10:17:41AM +0800, Marky Yehezkiel (SNC) wrote:
> Oct 6 20:47:06 smtp2 postfix/smtpd[58410]: 8F625267977:
> client=unknown[190.26.129.204]
>
> I want to make policy If source IP 190.26.129.204 and 90.183.38.135 with
> port 25 is not open then postfix will reject the email.
Won't get any mail from most large sender domains with such a policy. High
volume senders (including the one I am sending from) use separate
hosts for inbound and outbound mail, and the outbound hosts don't have
public port 25 listeners. This approach is not viable. Consider using
zen.spamhaus.org instead (to block most illegitimate email emitting
systems), and sign up for a paid rsync feed if your inbound volume is
high enough. Consider adding greylisting, and content scoring systems
such as SpamAssassin (perhaps via amavisd-new). A combination of systematic
measures will work better than ad-hoc heuristics.
--
Viktor.
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