Gary wrote:

> Since I don't see any SA timings, I'm really interested how spamassassin
> is called.

I have no idea if Gianluca is using spamd/spamc or not but:

I was personally curious about the efficiency of using spamc
outside of amavisd-new, compared to having amavisd-new call SA.
I did an anecdotal test by feeding a test message a number of
times through spamc:

time spamc -u amavis < sample-spam.txt
and it was fairly consistent at around 14 seconds. (800Mhz Celeron)

Sending the same messages through amavisd-new a few times showed SA
check at 2.4 seconds, dropping to .7 seconds at times.

I then installed a local dns cache (djbdns) and tried the tests again.
spamc dropped to around 2-4  seconds (decreased with the second test),
and SA check within amavisd-new was around 2 seconds, dropping to .7
seconds at times.

BTW, much to my surprise, I also noticed that 'SA check:' does not
necessarily appear in every entry. I imagine this due to caching. So
I would assume that at times, the spam check is free. This of course
could explain why I did not see any SA checks in Gianluca's post.

I wouldn't absolutely draw conclusions from this, but it appears to me
it's a good idea to point your resolver at a caching DNS server, and
amavisd-new uses spamassassin more efficiently than spamd/spamc. Not
even counting the fact that within amavisd-new, SpamAssassin is called
only once for each message regardless of the number of recipients.

Gary V



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