I agree with previous poster RE: Postini, we have clients that use the service and it's fantastic.
I use Postfix / Amavisd - Clam-AV / SpamAssassin + SARE rulesets (with DCC, Pyzor, Razor) locally and ater the initial setup it's excellent.
I've also done just Postfix / Amavisd - Clam-AV / SpamAssassin + SARE and used Greylisting for other clients as well and that's been unbelievable. Greylisting as a method to reduce spam is the heat!
In both of the above setups are spread across 3 machines in a multi-tiered architecture. Use your DMZ to pre-filter, with Postgrey, header checks, body checks, then allow to next hop where you can spam-check, virus check, then allow to local intranet mail server for local delivery / IMAP.
But if you want to farm it out - use Postini.
-Peter
2008/6/8 Jason Pyeron jpyeron@pdinc.us:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Frank Cox Sent: Sunday, June 08, 2008 4:04 PM To: CentOS mailing list Subject: Re: [CentOS] sendmail and spam
On Sun, 08 Jun 2008 15:39:31 -0400 Mark Weaver mdw1982@mdw1982.com wrote:
I.e. if a business in Pennsylvania only does business in the lower 48 there isn't any need to accept port 25 traffic from Asia, Europe, Latin America, etc...
We have foreign language emails from foreign countries, so this and other assumptions about content are a big no-no.
Until "something comes up" and your users and/or customers are sunk.
Ditto.
We are using Postini. It is a spam filtering service from Google at 3$ per email address (aliases are free) per year. We have no load they are promising the API will be re-enabled in the upcoming weeks.
We have only had 2 messages with a false positive and one with a false negative. Mail volume is around 10,000 messages per day. Latency is next to zero.
Sorry for the advert, but its what we are using.
Jason
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