Forum Discussion
Mail relay to Office 365 from IIS SMTP Relay
Since about a month we cannot relay email from our IIS SMTP Relay to Office 365. This has worked for a long time, therefore I do not get why it is not working anymore. The account used is still activ...
Hi, there have been made som changes starting 2017
https://blogs.technet.microsoft.com/exchange/2016/03/29/important-notice-for-office-365-email-customers-who-have-configured-connectors/