I tried posting this twice at the website and it appears to blackholed both 
times, don’t know whether it’s a new-user moderating thing or what. So 
apologies if this is a duplicate


Hopefully, this is simple. I know nothing about the innards of Mailman -- I've 
been just using it as a black box for a decade and it's been working fine.

Today, in the process of handling a subscriber's non-delivery complaint, I came 
across this error message in WHM's Mail Delivery Reports:

From Address:   mailman-l...@server.wickenburg.us
Sender: 
Sent Time:      Feb 22, 2025, 6:48:18 PM
Sender Host:    server.wickenburg.us
Sender IP:      127.0.0.1
Authentication: unauthorized
Spam Score:     0
Recipient:      r...@cloud-ci.unifiedlayer.com
Delivered To:   
Delivery User:  
Delivery Domain:        cloud-ci.unifiedlayer.com
Router: reject
Transport:      **rejected**
Out Time:       Feb 22, 2025, 6:48:18 PM
ID:     1tm16p-00000000BOG-aS00
Delivery Host:  server.wickenburg.us
Delivery IP:    127.0.0.1
Size:   0 bytes
Result: The mail server could not deliver mail to 
r...@cloud-ci.unifiedlayer.com. The account or domain may not exist, they may 
be blacklisted, or missing the proper dns entries.

The recipient identified is not anything I ever set up. "unifiedlayer" belongs 
to my hosting provider, so this may be some sort of default or unset value. 
I've scoured the Mailman configuration screens for anything resembling this, or 
any field I should have provided but left blank, and I'm buffaloed.

Where is Mailman getting this value from, and how to I change it to something 
more useful?
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