[Dovecot] Password field limitations

Hi,

I've searched the WIKI for this information but seem unable to find anything about it.

What limitations are imposed on the password for IMAP/POP3 users? I've had a customer saying they can't use passwords which contain "." or ":", and some seem to have problems when the password is 8 characters.

I use PLAIN authentication, passwords are stored in a MySQL database.

Thanks a lot

Tom Sommer