[rt-users] Disable auto reply if user not in RT database

[Georghy]

Hi everyone,
I'm searching for a way to disable auto reply to user if they are not in 
the RT DB
I think I had to create a custom action to do it
where can i get some info about custom condition/action how to do it and 
what are the
variable I can use ?
I think I should modify the scrip "On Create Autoreply To Requestors"
can you give me some tips ?
thanks

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Cordialement / Greetings