EM-3112
Microsoft stopped sending from this mailbox
Why it happens
Exchange Online refused to send: the mailbox reached its daily sending limit (10,000 recipients a day), or your Microsoft 365 administrator or its protection blocked sending from it.
What to do
Wait until the daily limit renews, or ask your Microsoft 365 administrator to check the mailbox in the security center (restricted users), then send the reply again.
- HTTP status
- 422
- Retrying does not help