I'm looking to move some mailboxes to the
Office365 exchange plan, however I also need to keep existing POP3 accounts.
Option 1: Is there a best practise for this setup? Do you simply allow Office365 to send from the domain, whilst keeping the old mailbox as a forwarder to the Office365 one?
Option 2: Or do you look to go the other way round, point the MX records to the Exchange server, and then have forwarders on that to a proxy domain to the old POP3 mailboxes?
I'm leaning towards option 1 myself, but open to any more ideas.
Edit to add: There's two domains, a
.com and a
.co.uk with the
.co.uk aliased as a
CNAME to the
.com so essentially they're the same.
The current POP3 mailboxes are all on the
.com domain but receive email from both the
.co.uk as you'd expect.
Currently, I just need to move one POP3 mailbox to the Exchange (Office365) setup. I could keep the domain setup "as is", and use the Office365 mycompanyname.onmicrosoft.com as their login, and use either POP3 collection or mail forwarding from the POP3 account.
I'm concerned that messing around with MX records too much could cause more headaches in the future with a split setup. I appreciate that the usual setup is one domain per MX destination.