Outlook / SMTP error code 554
smtp;554 5.2.122 The recipient has exceeded their limit for the number of messages they can receive per hour. For more information go to http://go.microsoft.com/fwlink/?LinkId=526653. (#) [outlook.com]
The Microsoft 365 or Office 365 recipient has exceeded the number of messages they can receive per hour from all senders.
Documentation
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