How I have to configure my mailboxes in the POP/IMAP clients

[Andres Tarallo]

 I'm about to deploy a new mail server, with postfix and cyrus IMAP
2.2.13 on Ubuntu 8.04. I can't access my mailboxes via POP3 neither
IMAP.

 I've created my mailbox in cyradm as follows:
username at mailserver.domain. Mail is being delivered successfully to my
 mailboxes, but I can't access them. What is the proper username for
the  mailboxes?

Thanks


 Andrés