Hello I have recently taken over management of a website for my advanced 
motorcyclists' group. The site is Wordpress based and we are setting up a 
mailing list using the WP Mailster plugin. However, when sending an email to 
the list I receive the following error:

"This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its 
recipients. This is a permanent error. The following address(es) failed:

  pipe to |/usr/local/cpanel/3rdparty/mailman/mail/mailman post 
committee_mbeam.org.uk
    generated by commit...@mbeam.org.uk
    local delivery failed"

As stated in the thread title, Mailman is not installed in Cpanel as our 
hosting provider does not allow it to be used. Speaking to the previous 
webmaster it seems that Mailman was used with a previous hosting provider, so 
I'm wondering if some configuration may have been copied across with the 
website to the new host server which could cause this error.

I have searched the directories and found several one directory and several 
files with Mailman in the title or text. The directory is 
/.cpanel.mailmanconfig and contains files for each of the lists that were used 
with Mailman and each file contains text similar to: 

{"owner": ["li...@mbeam.org.uk"], "private_roster": 1, "archive_private": 0, 
"advertised": 0, "subscribe_policy": 2}

There are two directories files in the cpanel cache from 2012 and 2017 that 
refer to mailman-list-usage. 

To test if any of these files were causing the problem, I renamed them with a 
bak prefix, but I still receive the same error.

Siteground support has looked at the site for me and said that there does not 
appear to be any config file that should not be there, but as WP Mailster is 
third party software and they do not support Mailman, they can't help further.

I should add that we have used phplist and that works without any errors.

Any advice will be gratefully received.
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