This is done so a single recipient's mail processing doesn't unfairly impact other recipients sharing the same mailbox database.įor more information about this by-design throttling, see Store Driver Fault Isolation Improvements in Exchange 2010 SP1.Ĭonnection refused The recipient mailbox's ability to accept messages is being throttled because it's receiving too many messages too quickly. STOREDRV.Deliver recipient thread limit exceeded The following table contains the error codes (also known as enhanced status codes) for the most common Bounce Messages and errors that you might encounter in Exchange Online. Find my error code and get help delivering my email NDRs include an error code that indicates why your email wasn't delivered, solutions to help you get your email delivered, a link to more help on the web, and technical details for administrators. Non-delivery can be caused by something as simple as a typo in an email address. The most common type is called a non-delivery report (NDR) and they tell you that a message wasn't delivered. The email you receive is a delivery status notification, also known as a DSN or Bounce Message. When there's a problem delivering an email message that you sent, Microsoft 365 or Office 365 will generate an error code and often will send an email to let you know.
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