Has anybody tried setting Courier up in a sealed system? ie mail is stored
somewhere, all owned by the courier user and authenticatioin is completely
seperate from the system accounts.

In this scenario, usernames should be of form user@domain, so it needs to handle
'@' and '.' in the usernames.

I'm currently using Postfix, MySQL, Cyrus to provide this, but I have to use
usernames such as user_domain, which is not convenient for the user.

Also, Postfix doesn't use connection pooling, which puts a big load on MySQL.

What are your thoughts on this?

A.