Confirmation when pressing Reply instead of Reply All on messages with Cc.

[chrilley]

I have made this mistake too many times. When there is a Cc list of addresses I would appreciate if Thunderbird would notify me before my reply is sent.

For instance when clicking reply there could be a pop up saying;
"This exchange has multiple addresses involved. Are you sure you only want to reply to the sender?" 

I believe this would greatly help reduce my fumbling!

Thanks!

[Jon]

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