i don't need an A.I that can decide what answer to give the client (canned response).
i'm just looking for a simple way to add my 134 characters-long signature to each response-to-client.
plugins are also welcomed, but i couldn't find such.
This plugin is expensive, but probably would do what you want. Essentially you'd pick the template with your signature first (before typing your response).
A different approach would be to find a keystroke automation tool at the O/S level:
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