The problems was a compiled qmail-pop3d+vpopmail.c.diff patch

I found it by comparing the strace output of the test server and the
production server and noticing a systemcall to getpid which wasn't
happening on the production server.

I grepped for it in the sources of qmail and noticed a patch was
applied. I reversed the patch (in this case for pop3 traffic logging) 
and recompiled.

This time, everything is working as it should.

Thanks to all that helped isolating this problem

- Steven

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