You can resolve above error by using following command form your shell but make sure that you are logged in as a root user.

root@gunjan[]#chmod 02775 -R /usr/local/cpanel/3rdparty/mailman/

and if its also not resolving your issue then you can read more on it here….

If above command won’t resolve your issue, then you have to reinstall mailman by using following steps.

First take backup for current mailman directory.

root@[/usr/local/cpanel/3rdparty]#cp mailman mailman-back -R

Confirm disk space usage for both directory.

root@[/usr/local/cpanel/3rdparty]#du -sh mailman
407M mailman

root@[/usr/local/cpanel/3rdparty]#du -sh mailman-back
407M mailman

Then run following command

root@[/usr/local/cpanel/3rdparty]# /scripts/reinstallmailman

or

root@[/usr/local/cpanel/3rdparty]# /usr/local/cpanel/bin/mailman-install –force

It will resolve your issue and you won’t face any further trouble. Enjoy mailman power

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