The problem is that I have users on different servers and I would like the user or the administrator of the database to decide what server to do the lookup from.
Subject: Can user decide (select) server in a field-formula - @DbColumn
you can build your own list of servers and let them choose using @Prompt or if you want to open the db on the users home mail server you can use @LocationGetInfo([HOMESERVER]) to get the mail server from the location doc.