Hello,
Upon creating a new account I've encounter a problem. If the account is a@domain.com and I want to sent it with another FROM address like b@domain.com the message will be discarded. The problem is that b@domain.com is an account as well.
I tried setting it up in: Exchange -> Mailboxes -> A's account -> email address and added b@domain.com but it didn't worked, it told me:
The proxy address "smtp:b@domain.com" is already being used by "b". Please choose another proxy address.
Any ideas on how to fix this issue?
Looking forward to your reply.