Macs R We via Mailman-Users writes:

 > 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

It's non-subscriber moderation.  I don't know about recent statistics,
but historically checking that the poster is a subscriber has been
enough to keep out 80-90% of spam.  I've registered your address as a
nonmember user.  You probably should claim that address using the web
ui at mail.python.org/mailman3, but your future posts will go through
even if you don't claim it.

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

That's cPanel, right?  We'll do what we can, but cPanel Mailman is
ancient (I mean we end-of-life'd Mailman 2.1 half a decade ago), and
it's heavily patched by cPanel.  They or your hosting or email
provider should be the first place you go, as we have very little
visibility into what can go wrong with cPanel Mailman.

See https://wiki.list.org/DOC/Mailman%20and%20CPanel.

 > 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.

This looks like somebody is spamming your mailman@YOUR.DOMAIN to me.

 > 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?

If you mean "r...@cloud-ci.unifiedlayer.com", that should be the owner
address of the mailman@YOUR.DOMAIN list.  How it got there, you'll
have to ask whoever set up the Mailman installation.  To change it,
you need the password to that list or the site password (the password
you need to create lists).

For more information: Somewhere there should be a source or
documentation directory where you can find mailman-install.txt and
probably an HTML-ized version.  Search for "mailman-loop" to get to
Section 6, and "site list" to get to Section 8.
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