I've setup a mailsystem for a customer using postfix, courier-imap/pop3 with authdaemon running against MySQL with authmysql. The system is running for a web-hotel and they have ~1100 users spread across about 200 domains.

We've planned to switch servers as smooth as possible with as little client-action as possible.

My problem is this: The usernames in the sql-table are in the form "mail...@domain.tld", the system is already setup, all users are added and all we need to do is change a couple of dns records to get the server running. But a couple of days ago i discovered all users are setup to use the username "mailaddr/domain.tld". the old windows-based solution is in a remote location which will loose it's internet-connection on january the second, and there's almost nothing we can do to keep it running for a while longer so it will be a lot of supporting to do if we cant get the server to accept "mailaddr/domain.tld"

I've tried editing the sql-syntax in authmysqlrc so that it will try both @ and / when logging in, but when we try to login with mailaddr/domain.tld pop3d wont even query the sql-server and simply returns a "login failed" to the logs (even though i've set loglevel to 2 in pop3d).

is there an easy way to do this?, Does a solution even exist?

I would be very glad for any help i can get.