Best practice alias
I've been browsing for the right solution, but I can't find a proper explanation. I have a user with an email address and licenses; I would like to add 2nd and 3rd email addresses to this user. The u...
Forum Discussion
That's the expected behavior. Exchange traditionally only allows to send messages via the Primary SMTP address. A while back this was extended to allow sending from any alias, as detailed here: https://techcommunity.microsoft.com/t5/exchange-team-blog/sending-from-email-aliases-public-preview/ba-p/3070501
Using this method will not result in "send on behalf of".
Using this method will not result in "send on behalf of".