SMTP settings not available?


Dear fellow users of Rocket Chat,

I cannot configure the SMTP at Administration settings > Email > SMTP like described here
The interface simply lacks the fields to enter SMTP settings, like the protocol, host name, etc.
Here is the screenshot of my interface:

There are only two parameters there, “Ignore TLS” and “Pool”, but nowhere to enter the settings of the SMTP server to (in contrast with the image in the documentation). I have the administrator and owner privileges.

Am I missing something?
Could anyone tell where to configure SMTP?

Many thanks indeed!

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