See https://www.mail-archive.com/mailman-users@python.org/msg73654.html

That may help.

On 04/20/21 13:12, Bader, Robert (Bob) wrote:
> I think I know what is happening , but I want to make sure. A bunch of my 
> list admins are getting bounces like below?
> 
> I think it is someone or probably a BOT, trying to subscribe to our lists, 
> But they are using a bad email address so it bounces to the admin. (Our lists 
> are set to confirm/approve for joining).  I assume they are just trying to 
> join any lists that don’t have confirm/approve to see if they can then get 
> the users of the list, maybe, What else could they be trying to do?
> 
> I have seen a couple of different bad emails addresses used, so I just can’t 
> ban this one,  I am telling list admins to ignore them. But if they get worse 
> I think they can set this setting to “NO”
> 
> Should Mailman send you, the list owner, any bounce messages that failed to 
> be detected by the bounce processor? Yes is recommended.
> (Details for bounce_unrecognized_goes_to_list_owner)
> 
> Which would stop these notifications? But it is recommended to leave it to 
> “yes”.
> 
> 
> Any other options ideas?  Am I on the right track?
> 
> 
> Here is a bounce example with  our list info stripped.
> 
> ***********************************
> Error: Invalid user address
> 
> Error message below:
> 550 - Requested action not taken: no such user here
> 
> Message details:
>   Subject: confirm 174c7e02aa6603b72ba30e59c5e24c7fceebd826
>   Sent date: Wed Apr 14 23:08:48 UTC 2021
>   MAIL FROM: xxx-software-xxx-boun...@mailman.xxx.xxx
>   RCPT TO: 17323547...@vtext.com<mailto:17323547...@vtext.com>
>   From:
> < XXX-software-XXX-request@ mailman.XXX.XXX >
> 
>   To:
> <17323547...@vtext.com<mailto:17323547...@vtext.com>>
> 
>   Size: 11.3 KiB
> 
> 
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-- 
Jonathan Baron, Professor of Psychology, University of Pennsylvania
Home page: https://www.sas.upenn.edu/~baron
Editor: Judgment and Decision Making (http://journal.sjdm.org)
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