I am knee deep in an upgrade from Exchange 2010 to Exchange 2016 in the office. There have been many challenges that I will be addressing in another post, however I thought this one regarding iOS 11 to be important enough to write about it today.
Cannot Send Mail. The message was rejected by the server.
I have one user on the network that is receiving this message when they attempt to forward or reply to th
eir mail on my exchange server. When composing a new message the mail is delivered as expected. The fact that this is a new server and the user was migrated just days before led me to believe the issue was on my end.
Failed Fixes:
- Restart IIS with an IISRESET command
- Remove the email profile from the iPhone and recreate it
- Restart the entire exchange server
- Review the log files for any clues.
None of the above was able to fix her issue. Further more, my own iPhone was on iOS 11 and at least a dozen other users had upgraded and their devices were working properly.
I was about to give up when I stumbled across this article today from Apple Continue reading “iOS 11 – Cannot Send Mail. The message was rejected by the server.”