Yes, when you use the M365 Channel, notifications are still configured in the E-Mail channel.
So the next question is could your solution of using the local MTA instead be changed to use the relay I have configured on my other server?
Probably. The M365 channel is basically a special mail channel with some fixed settings like outgoing SMTP. You could try: configure SMTP in the Mail-Channel and see what the options[“outbound”] property of the mail Channel object shows. Change the M365 Channel object accordingly.
Also, are there any kind of issues with using the config you mentioned?
We have been using this setup for nearly two years, no problems at all of any kind, just make sure Zammad max mail/attachment size and the one configured in the MTA are in line. We have been using this setup over multiple minor version updates and the major update 5.x to 6.x and the setting has always been retained. Still I check after every update just to be sure. I don’t think there will be problems as long as there is no major change in the channel architecture.
