We have a setup of a shared Microsoft 365 mailbox as inbox, but the outgoing mail is handled via a separate (internal) SMTP relay (which does not have the limitations of the Microsoft SMTP server)
Until yesterday, we just used a normal Email channel to make it work. But from today, the basic IMAP authentication is not working for us, so we switched to the Microsoft 365 Channel which authenticates via Oauth2.
With this setup, I had to enable basic SMTP authentication for the whole organization, since the shared mailbox is unlicensed and I cannot enable basic SMTP authentication only for this account.
That’s why I would like to have a split setup, inbox via Microsoft 365 channel, but a separate outgoing configuration.
Best regards,
Georg