Issue
Technicians receive rejection errors when attempting to configure the SMTP email for NinjaOne Ticketing.
Environment
NinjaOne Ticketing
Cause
A common reason for rejection is an undelivered email.
Resolution
Check the mailbox you configured to ensure this is not the case or perform a mail trace to determine whether the email was received, rejected, deferred, or delivered. Microsoft provides instructions here for both classic and modern Exchange admin center.
You should see the results of any emails which have been attempted to be sent. Click an email to view more details on why it failed.