Issue with connecting to mailserver

[FuckingToasters]

I modified the script a bit (removed the ssl stuff because i added ssl to mail subdomain via nginx proxy manager)

After the script finished executing, i added user billy with password billytesting and tried to connect to it via thunderbird
[e-mail]:billytesting

However, i wasn't able to connect.

An A Record to the mail subdomain with the public vps ip also exists (just not on the screenshot)

[Ashio]

Did you set the hostname in Thunderbird correctly?
It looks like you entered .mail.... instead of mail.... (There is a dot before mail....) (note sure if that's a problem)

Could you share a screenshot of your Nginx Proxy Manager config?