Follow along with the video below to see how to install our site as a web app on your home screen.
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The APS Catalog has been deprecated and removed from all Plesk Obsidian versions. Applications already installed from the APS Catalog will continue working. However, Plesk will no longer provide support for APS applications.
Please be aware: with the Plesk Obsidian 18.0.78 release, the support for the ngx_pagespeed.so module will be deprecated and removed from the sw-nginx package.
I know very little about qmail and am not a huge fan of it. I'm confident there is a way to do what you want, but you may have to hunt around a bit to find it.
Qmail is made up of several pieces and it's possible to modify just one piece and leave the rest intact. You'll probably want to find a patch to the 'qmail-remote' piece since I think that handles SMTP connections.
Exim is another MTA (mail transfer agent), like sendmail, qmail or postfix. I believe Cpanel uses exim as it's MTA. I've been using exim for many years and it's the one I'm most comfortable with.