Erik Hensema / HostingXS wrote:
relay_is_blacklisted_multi() seems to be the culprit. Are there any
multitheading issues with this function?
The Perl code in MIMEDefang is single-threaded.
My filter first calls relay_is_blacklisted_multi() with a list of dns
whitelists. When $RelayAddr is whitelisted, the filter skips the second step,
in which dns blacklists are checked.
However, in some (rare) cases relays are blocked even though there are
whitelisted and not blacklisted on any blacklist.
I can't see how this can be caused by my filter code.
Could the whitelist lookup be timing out? Add some print STDERR ... debugging
and see...
The server I'm running mimedefang on is fairly busy. Typically 3-4 mimedefang
childs are running. We're peaking at about 2 smtp connections per second
sustained for several minutes. Typical load is 1 smtp connection per second.
:-) That is not "fairly busy" in my book. We have a customer on whose
machine we see 95 busy scanners and we've seen 75 RCPTs per second with
10 scans per second.
Because of the apparent random results, I suspect this to be a thread-safety
problem.
Nope. MIMEDefang was designed from the ground up not to have thread-safety
issues; the Perl scanners are each isolated in their own process.
Regards,
David.
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