Domain of sender address ... does not exist

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I'm occasionally seeing the following error:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email protected]
    (generated from [email protected])
    SMTP error from remote mail server after RCPT TO:<[email protected]>:
    host mail.redfish-solutions.com [66.232.79.143]:
    553 5.1.8 <[email protected]>... Domain of sender address [email protected] does not exist


This is on an externally generated email that is coming into my domain
(redfish-solutions.com). The mailbox name is valid (it's been munged
here to protect against spam address harvesters).

Looked at the cf/cf/generic-linux.cf briefly, but it's been too long
since I've munged .cf files (these days I cop out and us the .mc
versions instead).

What's going on, and how do I fix it?

Thanks,

-Philip

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