In Thunder bird Auto Type Already Inserted ( Type ) message in a Short Key or Need a Button

[PrashantJoshi17]

When i type reply to my client i want to type a fixed message that your query is resolved check and reply...

I want to Assign this message to a  short cut key when i press that key message will automatically type in write email section or generate a button which will type a Message which is we saved

Since mentioned wanting to trigger it with a shortcut key or button: 

[Jon]

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