We've moved from an on-prem Exchange server to O365, I've changed the System >> General Settings >> SMTP Server to the appropriate O365 SMTP server host as per option 2 of https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-dev...;
Alerts are being sent after the changes e.g. AP's down etc. but emailing of guest passes fails. The only error I can find is in Events & Alarms >> Events:
Code | Type | Severity | Activity
982 | Email sent failed | Warning | [IDM] sent email to [name@domain.com] failed.
The guest passes are only sent to internal organization users.
We are on Controller version: 5.1.2.0.302
What am I missing? Is there another place to setup SMTP server?
