Cyrus login with user@domain.com ?

[Marcel Hicking <m.hicking@vianetworks.de>]

Hi folks

I'd like to login to Cyrus via pop3/imap
with a login "user@domain.com"
Unfortunatelly Cyrus barks with -ERR Invalid user
right away.

Just to make sure I've tried both passwd/shadow
(pwcheck standard) and pam/mysql (pwcheck_pam).
Doesn't make a difference - which is to be expected
since I couldn't even enter the passwd.

Obviously the dot is the problem. Without it everything's
fine. So this currently doesn't even allow logins as
"first.lastname".

Any ideas how to "fix" this (or work around it in case
it's intentional)?

TIA, Marcel