We need to change all of our users' email accounts to include an additional address. This new address should also be the primary address (so that it appears as the reply to/ from address). Users will need to receive emails sent to both domains. As an example, John Doe has email address jdoe@ABC.com. His new address should be email@example.com. He will need to receive emails sent to both addresses.
I have done some reading, and was wondering if this can be done easily through the default recipient policy. If I add a new additional email address, with the syntax %g.%s@XYZ.com, set it as the primary email, and apply the update, will this work smoothly? If not, can anyone please give me a suggestion on an easy way to roll this out through the entire active directory?