Hi,
Messages in deferral will remain in our queues for 2 days. And on average, messages are retried every 5 minutes. So no need to force them to make a retry attempt.
Is there Exchange Online Protection (EOP) filtering in your environment? Or have you done something changes on your firewall or antispam software recently?
What's the last error for deferred messages?
Best Regards,
Lynn-Li
TechNet Community Support
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