• The new Python extension is now available. It allows customers to deploy and manage WSGI-based Python applications on their websites directly from Plesk.
  • The Plesk Mobile apps for iOS and Android and the Plesk Mobile Center extension have been deprecated, and are no longer available for new installations. In Plesk Obsidian 18.0.84, the Plesk Mobile Center extension will be removed from servers during the upgrade, and the Plesk Mobile apps will lose their server management features.
  • The Social Login extension has been deprecated and will be removed in Plesk Obsidian 18.0.84. After that, it will no longer be possible to log in to Plesk with a Google, Facebook, GitHub account, or with a passkey. Plesk usernames and passwords, as well as logging in with a WebPros Account, are not affected.

Resolved postfix with SSL

* Go to Tools & Settings => SSL/TLS certificates
* Make sure you have a valid Let's Encrypt certificate
* Make sure that certificate is selected at "Certificate for securing mail"

That's all you need to do. Postfix will then be configured to use your server's Let's Encrypt certificate
 
Thats the Problem:
server certificate is a self-signed and I need to secure the emails of all domains with there own certificates.
 
This is not (yet) possible. In order for this to work you would need to have Postfix 3.4 with SNI support, which was only released a couple of weeks ago. And as postfix is provided by the OS, you will have to wait until your OS supports Postfix 3.4 _and_ Plesk added SNI support to Postfix. Both of this will probably not happen in 2019.

So for you the only way to get rid of any SSL/TLS warnings for your mail users is:
1) Install a valid certificate for your server (preferrably Let's Encrypt)
2) Secure Plesk + mail services with that certificate
3) Tell all your customers to use your server's FQDN to retrieve and send their mail (the hostname for which you issued your certificate)

Please also read this thread:
Input - Add multidomain-support to Let´s Encrypt Certificate used for the mailserver
How to assign separate SSL certificates for different domains on a local mail server in Plesk?
 
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