--On Wednesday, June 23, 2021 10:54 PM -0400 H <age...@meddatainc.com> wrote:

Viewing /var/log/maillog I get some information but cannot see which
application generated that e-mail, nor the content of it which would
likely allow me to see where it comes from.

Can anyone suggest how to track down the app so I can reconfigure the
mail address?

Hold all delivery so you can examine the mystery message in the queue. I found this article on how to hold mail with Postfix:

<https://serverfault.com/questions/92981/how-do-i-temporarily-suspend-mail-delivery-to-a-specific-domain-non-local-with>

This requires creating the file /etc/postfix/hold with a static hold rule and "compiling" it with the postmap command. Add a line to main.cf to use the new map.


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