[CentOS] Tracking down application sending mail in CentOS 7

Thu Jun 24 02:15:03 UTC 2021
Kenneth Porter <shiva at sewingwitch.com>

--On Wednesday, June 23, 2021 10:54 PM -0400 H <agents at meddatainc.com> 

> 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:


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.