Problems forwarding emails

[mrwsl]

I'm self-hosting and have problems simplelogin not forwarding emails send to an alias. I think I'm stuck with postfix not being able to connect to sl-email since I don't see anything about the incoming email in the logs.

What I did do: I created a user that runs simplelogin and added it to the docker group. Is there anything else I could check (like postfix logs where I can see an error)? I did check the instructions again but couldn't find my mistake. Thanks in advance!

[mrwsl]

I completely forget to setup firewalld. Adding smtp service fixed it!