Ah, that changes everything. :)
If they want to standardize on username@ourchurch.com:
1. Get a fixed IP.
2. Get a domain name.
3. Run a sendmail variant (strongly do not recommend sendmail itself: qmail, exim, etc. are better).
4. Let 'em use whatever client they want.
If they still want AOL, etc to be primary accounts:
In my experience, it's best to let the client software do multiple account merging, not the server. You're basically asking the server to pretend to be a client, which rarely works well--might as well have each client do it in its own finicky way. Most MTAs (email servers) want to deal with SMTP communications, not POP3 or IMAP.
Many fears are born of stupidity and ignorance -
Which you should be feeding with rumour and generalisation.
BOfH, 2002 "Episode" 10
