Spamprobe deterministically core-dumps with signal 11
on Linux (x86) and AIX (rs6000), both with BerkeleyDB
This happens on learning mail with spamprobe 1.4 and 1.4a.
I attached a small test email to trigger the bug.
I think the problem is related to base64 decoding, as
the bug is not triggered after removing the
corresponding line from the test email.