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External mail problems

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by shadow1

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A problem exists wherein certain users are unable to send mail outside of the domain. Some are outlook and some express. Getting 'unknown recipient' response on bounce back. DNS is handled outside domain.

2 replies

by [_rick_>

Do these occur only for a specific domain that these users are sending to?

Do these occur for these users no matter who they send to?

If you sent a test message to one of the 'unknown recipients' does it fail or go through?

Has the address they are trying to send to been verified that it does not contain any 'false' characters? like a space at the end or beginning.

by shadow1

Any domain outside our own.
Yes, it does not matter whom they send to.
Address has been verified by myself on several workstations.
It is something in the IMS config I believe. But why some and not others?

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