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X-Spam-Report: Spam detection software, running on the system "beer.ux6.net",
	hasmessagelabel	similar future email.  If you have any questions, see
	the administrator of that system for details.wrote: >
	We have been using qpsmtpd in our mx for almost 2 years now. It is
	high	in terms of > cpu and memory usage. > > It checks for: > > early
	resolve	> tarpit limit > badmailfrom > badrcptto > dnsbl > recipient
	verification from radius for local domains > spamassassin > grey
	listing > > and lot more. [...] 
	Content analysis details:   (-5.9 points, 6.0 required)
	pts rule name              description
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	-3.3 ALL_TRUSTED            Did not pass through any untrusted hosts
	1%	[score: 0.0000]
cc: Bikrant Neupane <bikrant@wlink.com.np>
cc: vaida bogdan <vaida.bogdan@gmail.com>
Subject: Re: mail software for freebsd
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On Friday 08 April 2005 05:31, Bikrant Neupane wrote:
> We have been using qpsmtpd in our mx for almost 2 years now. It is written
> in perl and is modular but resource utilization is very high in terms of
> cpu and memory usage.
>
> It checks for:
>
> early talkers
> spam helo
> max limit to unrecognized commands
> dns resolve
> tarpit limit
> badmailfrom
> badrcptto
> dnsbl
> recipient verification from radius for local domains
> spamassassin
> grey listing
>
> and lot more.

You could try "qmail-spp" addon to qmail - it is able to perform most of the 
above, and it is written in C and uses much less resources.
I happily used it a lot before migrating to exim.

WWW: http://qmail-spp.sourceforge.net/

regards,
M.