In theory the task is quite simple. I just want to use an existing mail account we have at IONOS and use this to send notifications. IONOS provides this info:
Server: smtp.ionos.de, Port: 465, Connection type: SSL/TLS
And together with my email address and password sending emails should by fairly simple.
In practice I have tried a lot of guides on how to configure sendmail, postfix or mailx for a few hours now and nothing worked. I don’t even get error messages or logs. It just doesn’t do anything. Most guides assume you already have a local mail server, which we don’t. I don’t actually know anything about SMTP server configuration and most of this seems so overcomplicated when all I want is just to send a mail via SMTP.
We recently emphasized it in the general article on installation on non container Linux. It is understandable that you won’t look there. We’ll update the docker article accordingly.