> Ok, if I specify 
>
> protocol=smtp 
>
> what does that mean: "Connect through SSL-TLS protocol" or "connect through 
> STARTTLS protocol"?

That means connect using STARTTLS.

> It seems to me that I ALWAYS have to specify "protocol=smtp" for ALL 
> smtp-server connects.

You don't. If you are not using STARTTLS you don't specify "protocol=".

> Is this done only by port number 465 vs 587?

No. 

> That would mean there is a hidden configuration by convention!

Indeed. That would be bad.

> What if the webhoster would set up a special mail server at port 8888?

Then you would specify port 8888 in your "connect=" config

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