Broadly, Matthias' advice is correct. Here's some additions: Matthias Leisi writes: > > Perform DCC checks > > Perform Pyzor checks > > Perform Razor2 checks > > I don't run any of these and don't have the urge to enable them. The > other rules (including Bayes) work fine with me.
Turning these off will definitely help reduce load. > > Perform Spamcop reporting > > Perform AWL checks > > How big is your AWL file? It's not maintained automatically as the Bayes > files and can become *really* huge if not maintained manually (through > scripts). It's definitely wise to turn off AWL if you're having load problems. > > AutoLearnThreshold > > WhiteListSubject > > MimeHeader > > ReplaceTags > > URIDNSBL > > These are all core features which I would not remove. > > > HashCash > > How many hits does this give you? > > > SPF > > How much value does this offer to you? I have found the actual use of > SPF to be rather limited, but YMMV. > > > ImageInfo > > I don't use ImageInfo, and have little to no image spam coming through > (thanks to Bayes and RBLs), and I understand it is pretty CPU intensive. Actually, ImageInfo is quite efficient; it should be OK. > > VBounce > > Same as for ImageInfo, but I don't know how much additional load it causes. Again, not too bad, actually. > > Bayes > > BodyEval > > [..] > > The remainder of the plugins you listed are core features which I would > not want to miss. If you are *really* tight on resources, you may > disable Bayes, but doing so will noticeably decrease the ratio of > detected spam and may increase the number of false positives at the same > time. > > Other things to check: > > * Do your DNS queries time out (it may be that your DNS server is > limiting the number of concurrent recursive queries it is willing to > handle)? > > * What is the maximum size of messages you pass through SA? 256K seems > to be a good upper limit. Definitely worth checking. > * Is your machine swapping / low on memory, is it CPU, ... > > * What additional rulesets (SARE?) do you use? see also the advice at http://wiki.apache.org/spamassassin/FasterPerformance --j.
