Postfix and Dovecot – No encryption on SMTP

currently I’m working on my veary own mailserver but as for now I can’t get SMTP up correctly.
I use Dovecot with postfix.
When I try to ad my server to my mail client it tells me:
Outgoing: SMTP (my servers address):587, No SSL, Authentification: Normal password

I don’t know why I get this result since I thought I had everything set up.
I have no experience with postfix till today so I have no idea whats missing or wrong.
Here is my postfix main.cf: https://pastebin.com/S17jWDQd
Here is my dovecot.conf: https://pastebin.com/tMD90Znn
Most of these contents are copied from an iRedMail installation so I think I missed something while copying and modifying for my own use.

Thank you!

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Author: BDevGW