This weekend I've migrated my email from GSuite to Office 365 (or Microsoft 365 shortly), so far so good.
I setup a catch-all across the domains I have, so any emails sent to email@example.com will get dumped in my primary inbox.
I use this so I can set a custom email address for nearly every service, such as firstname.lastname@example.org, email@example.com etc, that way if one service leaks the email (as has happened a few times now) I can simply block emails sent to that account and move on.
This worked great in GSuite and appears to work the same in O365 as well.
In GSuite I had setup some of my commonly used ones as an alias, such as firstname.lastname@example.org, which allows me to then send from that email address.
I can setup the same in O365, but I've noticed I also have an option to enter an email address in the From field as well as select one from a list.
I've tried entering a non-alias address into this field but it fails saying I don't have permission to send from that account.
Basically what I'm trying to achieve is a way to send from any email address on my domain, even ones not setup as a mailbox/distribution list/alias.
Does anyone know if this is possible/how to achieve this?
I'm only using the Business Essentials plan as I don't require the desktop apps, so ideally I'd want to be able to achieve this using webmail only.