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
You mention MySQL 5 support is possible by having "external" and then you point to documentation which doesn't say absolutely anything about "external" e-mail server support. In fact SWSoft has a knowledgebase article posted on their web site which explicitly states that MySQL 5 support IS NOT POSSIBLE with Plesk 7.5.x: