1st problem - now I got a lot of empty messages after deleting spam (I have compiled vpopmail with this options - 'WITH_SPAMASSASSIN=yes SPAM_THRESHOLD=15 RELAYCLEAR=15 LOGLEVEL=e' on freebsd). Those e-mails are empty with this header (margaret.starnet.cz is my server):
I dont think vpopmail has that 'WITH_SPAMASSASSIN=yes; option.