Personally I setup addressbooks and dist. list using a full SMTP address in the form "FirstName Lastname"<user@example.com>  This way the username is part of the email address and the address is fully definitive no matter how it's delivered.  In addition I use the Mercury/32 PH server pointing at the system addressbook so that the POP3 users of Pegasus Mail can also access this addresbook.  One of these days there will be a LDAP server as well so that will add a lot more capability for a number of other email clients.

I was wondering what is the "best" way to set up address books? I have Mercury/32 looking for messages in queue directories on my servers. Mercury has all aliases set to username@mydomain.com mapped to username/servername. Pegasus Mail has Addressbooks that have username/servername for the e-mail address. My Distribution Lists only have the first and last names (Name or alias in Addressbooks).

One nice thing about this configuration is that I can stop and start my Mercury server and the non internet addressed messages will still deliver server to server. The slight problem is using a web interface (I use mail2web and IMAP) and the from line will show "username/servername" - this forces you to edit the reply to address or delivery will fail. I think I tried using a synonym file but they seem to only work if you store mail at the Mercury server (my messages are stored on the fileservers). What is my best option?