We are taking over a company and we want to redirect their email to us for a period of time. I figured I would change their mx record to point to gwia, add their domain name to our internet addressing so I could receive mail going to their old domain name. I would leave the default internet addressing set for each mailbox, so when they send new mail it would append our domain. The question is if their new mailbox/userid doesn't match, would I setup a nickname or alias?