Delivery has failed to these recipients or distribution lists

When customers were trying to e-mail us they were receiving the above error back.

Delivery has failed to these recipients or distribution lists

[email protected]
Your message wasn’t delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator

After a little investigation.   We have a mailbox which forwards the e-mail to an distribution group.  On the distribution group the Require that all senders are authenticated option was checked.  Unchecking this resolved the issue.

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2 comments

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