large mail broken - qmail

[Cristian Mijea]

Not really a freebsd question, sorry.
I have a mail server on a  freebsd machine. Qmail+SpamAssasin+Clamav.
At a first look, everything works just fine, but any lage atachement
gets corrupted.
Smaller mail is just fine.
Removed the extras (qmail-scanner, clamav, spamassasin) and still the same.
No problem receiving any mail, just when is sending it.

Anyone had a similar problem ever?

Regards!