One person gets - 571 Relaying not permitted


Mar 14, 2013
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Hi all,

This one has me stumped.

All of our staff have a local mail account hosted on one of our domain servers.

One member of staff cannot send mail from this account to anyone within one particular TLD.
Everyone else, using the same mail server, can send to anyone anywhere within the same TLD.

This one person gets their mail to <user>@<sub> rejected with a "571 Relaying not permitted" response.
Their mail to any other domain goes through fine.

If their email address was on a blocklist at I would expect a different response message.
If their local account was set up incorrectly in Outlook I would expect all of their mail to fail.
If our mail server configuration was at fault I would expect it to affect everyone.

Does anyone have any idea where to start looking? Please?

Many thanks,

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