What’s Wrong with Auto-Replies for Inactive Email Addresses?
The right and wrong ways to handle automatic replies to senders for inactive email addresses in an Exchange organization.
December 8, 2016
Latest Articles
Office 365: Delivery Has Failed to These Recipients or Groups
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.
July 26, 2015
Office 365 Bringing Much Needed Clarity to Email Non-Delivery Reports (NDRs)
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.
April 16, 2015
The Case of the 739,254 NDR Message Loop
The case of an Exchange Server environment experiencing very high message traffic due to an infinite loop of non-delivery reports.
October 23, 2012
NDR 550 5.5.1 User Unknown for Internal Relay Domain
An NDR 550 5.1.1 User Unknown error may occur in an Exchange Server environment that uses Internal Relay domains.
October 19, 2012