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On a stock CentOS 7.x Droplet, mailmanctl doesn’t seem to exist, at least not that I can find. The only mail application showing up is postfix.
Are you running a control panel? From what I can tell, cPanel and Webmin/Virtualmin do install it, so unless it is disabled from the CP, it’s normal for it to be running. In such a case, it’d be used to send e-mails and newsletters, or manage them for users.
If it’s not something that you installed, or that was installed by an application you’re using, then you’d want to look further in to why it’s running.
Hi @developerc9740c6fa8b2fbffc I don’t know python mailmanctl, but it has a very high CPU load for a mail server - unless you’re trafficing large amounts of mails. I would have a look in the logs and then restart the service too. But you might get better expert help in the mailing list of mailman (or by reading the FAQ): https://mail.python.org/mailman/listinfo/mailman-users