[Dovecot] Mailbox isn't a valid mbox file (dovecot 1.0-0.beta8.2.fc5)

[FiL @ Kpoxa]

Hello,

I have upgraded my dovecot-0.99.13-3.FC3 to dovecot-1.0-0.beta8.2.fc5
recently and now am having weird problem.

If somebody's mailbox has the first line in a form of
   From "User Name" <user at host.domain.edu>  Thu Oct  7 14:20:00 1999
instead of
  From user at host.domain.edu  Thu Oct  7 14:20:00 1999

then that mailbox couldn't be precessed by dovecot. It wasn't a problem
with 0.99.13, but it is a problem with 1.0.

Is there any fix for that on a dovecot's side? I don't like the idea of
going through all 100Gb of mailboxes and fixing the
 From line.

Thank you,

FiL