NDR Archives - Practical 365

What’s Wrong with Auto-Replies for Inactive Email Addresses?

Paul Cunningham — Thu, 08 Dec 2016 03:20:18 +0000

The right and wrong ways to handle automatic replies to senders for inactive email addresses in an Exchange organization.

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Office 365: Delivery Has Failed to These Recipients or Groups

Paul Cunningham — Sun, 26 Jul 2015 11:57:33 +0000

When an external sender attempts to send an email message to an Office 365 group they may receive a non-delivery report with status code 5.7.133.

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Office 365 Bringing Much Needed Clarity to Email Non-Delivery Reports (NDRs)

Paul Cunningham — Thu, 16 Apr 2015 00:44:32 +0000

Exchange Online (Office 365) will provide clearer, more readable non-delivery messages to help end users better understand the causes and solutions for email delivery failure.

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The Case of the 739,254 NDR Message Loop

Paul Cunningham — Tue, 23 Oct 2012 10:59:37 +0000

The case of an Exchange Server environment experiencing very high message traffic due to an infinite loop of non-delivery reports.

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NDR 550 5.5.1 User Unknown for Internal Relay Domain

Paul Cunningham — Fri, 19 Oct 2012 13:26:17 +0000

An NDR 550 5.1.1 User Unknown error may occur in an Exchange Server environment that uses Internal Relay domains.

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