How to stop automatic notifications

[Wise OWL]

Hi !

Is there a way to get rid of notification messages sent to other peoples,
like the "has left the conversation" sent when closing the chat window ?

I found no option to disable it, although it would be really useful...
Moreover, when I receive spam message from bots or bad guys, it would be
good not to reply them with this kind of notifications... Then they are
informed that their spam message have been received, and might invite them
to continue sending unwanted messages.

With my best regards,
OWL :)
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