This has become a classic problem for today's email system administrators. I use Spamassassin with Sendmail (and ClamAV running RedHat) and they all work well together. I kinda look at SPAM filtering with Spamassassin and Sendmail as a multi-layered process.
Layer 1) Use publicly available access denial list for Sendmail Layer 2) Define moderate RBLs in the sendmail.mc Layer 2b) Define sendmail.mc to not accept unresolvable domains Layer 3) Spamassassin filtering Layer 3b) Custom SA rules to add or subtract points based on words Layer 3c) Additional Spamassassin filtering with Bayes and Razor2 > I assume that part of making it a resource hog is rejecting know > "crap" before SpamAssassin has to make a decision on it. Personally, I think SA is the resource hog, the pre-spamassassin rejecting process doesn't seem too intensive. > Of course, by flat out rejecting the "crap" you also risk losing mail? Yes, some legit mail might not get through. But, in my case, the access file and the system-wide spamassassin config file helped fine tune the process. I found that most users preferred that their email was tagged as SPAM (although in my case, Layers 1 & 2 do in fact reject email) as opposed to just being dropped (as some organizations do) > That said, if you're going to dedicate a system to it, it'll be great. I agree. > (That's "sucks" in the geek terminology; it uses a lot of resources.) My setup is resource hungry too. Aaron On Tue, 2006-08-29 at 07:29 -0700, Roger Rustad wrote: > Looks like you answered my next question: sendmail vs postfix vs exim? > > I looked down the list of guides on SpamAssassin's site > (http://wiki.apache.org/spamassassin/IntegratedInMta) and just > arbitrarily picked one to go with. > > I assume that part of making it a resource hog is rejecting know "crap" > before SpamAssassin has to make a decision on it. Of course, by flat out > rejecting the "crap" you also risk losing mail? > > Roger > > > Jeff Lasman wrote: > > On Sunday 27 August 2006 04:11 pm, Roger Rustad wrote: > > > >> Anyone know of any good guides for SpamAssassin? > >> > >> I simply want a relay in front of my Exchange servers (which are > >> scattered all around). > >> > >> To make it easy, I'll probably just use Debian or Ubuntu. > > > > I hate spamassassin; it's a resource hog. > > > > That said, if you're going to dedicate a system to it, it'll be great. > > > > I've got some rulesets you can have if you'd like. From various > > sources; most of them around, but you never know what I've got that you > > might miss. > > > > And I highly recommend using exim on your front-end relay... very easy > > to configure, and you can run spam-assassin at data time so you can > > refuse email rather than drop it, depending on score. > > > > I'm not as up-to-date on the latter as I should be, but the method I've > > been using, scanning afterwards, sucks. > > > > (That's "sucks" in the geek terminology; it uses a lot of resources.) > > > > Jeff > _______________________________________________ > 909linux mailing list > [email protected] > http://909linux.org/cgi-bin/mailman/listinfo/909linux
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