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
Just talk to your hosting provider.There must be some issue with your webmail setting. They will definitely solve this. I was also getting the similar type of error. Mine incoming was working fine. Just outgoing mails are blocked. They solved them my issue. Now, the things are working fine.