Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
Also i think with this way you are losing the check of outgoing mail messages per hour. The correct way should be to be able to use SMTP relay when the email address it is present, even if there is no mailbox.