I installed with portupgrade tool from FreeBSD. It basically fetches
the source, applies some (FreeBSD) patches, if applicable, compiles and
installs the files.
I downgraded to 4.2.5 on both servers. This solved the problem on one
but not on the other. I do not know what to think. The recipients
were different in the test cases. So I crossed the tests but the result is the same.
One server works without a problem now, the other remains to be malicious.
I have enclosed the log files, so you can see yourself