Unable to process from lines (envelopes)

Hi,

Some of the users on my freebsd server are getting the "unable to process from lines" error when accessing their mailbox.

I've checked their mailbox and found that there was a blank line at the top of the mailbox.
Everytime i remove it, it appears again sometime later.
I've tried deleting the mailbox also, but that doesn't fix the problem.

Does anybody know what else I can do?

Any help is appreciated.

Only 'answer' I could find on it...

Qpopper FAQ