Hello Guys i've setup my servers in ISPConfig multiserver configuration. in this setup i have separate servers for: 1 server for web, mariadb, phpmyadmin, roundcube, redis, and ISPConfig control panel 4 DNS servers 2 redundant email servers (they sync/mirror their content each other) those servers are working good on ubuntu 20.04, mariadb 10.5, and Ondrej's php7.4 what i want to do now is to have ISPConfig mailing list to handle my wordpress email subscriptions rather than using eg. mailchimp or sendy. apart from that purpose, i think this is a good thing to do because i read articles about how to improve mail server deliverability, and at the bottom, they suggest that that mail server need to have mailing list; people must be able to submit/subscribe their email to server's mailing list. it's a sure way to make our email hit recipient's inbox rather than spam/junk mailbox. improving mail server deliverability by having mailing list is even better than spf, dkim, etc. i tried to setup mailman and ISPConfig mailing list but cant get thru. i also google ispconfig but very few information about mailman and mailing list. there's even a comment from Till on feb 13, 2021 that "Mailing lists are indeed outdated as they are not widely used anymore. We'll probably remove them completely from ISPConfig". i think mailing list is a powerful tool to improve mail server deliverability known only to a few that can monetize it to its full potential eg. mailchimp. and ISPConfig has it! it's great! but i still can't set it up. anyone can help? please.. Thank you.