|SaaS||DCI / Gateway|
It appears that microsoft is applying rate limits to SpamTitan currently. If your mail is being deferred with this response: 451 4.7.500 Server busy please follow the below documentation to set up a connector to fix this
Prevent 365 from rate limiting SpamTitan
Please use the below documentation to prevent 365 from rate limiting spamtitan and deferring mail
- If your outbound mail is being deferred please contact microsoft support and request that they add you SpamTitan IP to their "Throttling Exclusion List"