I have a company with two internal domains (Let's say Alice.com and Bob.com) with a local Exchange server. Let's say Charlie has both Charlie@alice.com and an alias in Exchange for Charlie@bob.com accounts. If I send an email to Charlie@bob.com, it comes through to the Charlie@alice.com account. Charlie cannot choose to send from Charlie@bob.com unless I make that his default send from address in Exchange, at which point he can no longer send from Charlie@alice.com.
How can I make it so that Charlie has access to both email addresses separate from each other?