Using the same Identity, 1. how can I create multiple different Signatures, 2. I would like to choose that an e-mail NOT have any Signature (by not inserting a Signature into that e-mail) or, 3. I would like to select one of the multiple different Signatures that I might have in the Account Settings file for that Identity and apply it to a specific e-mail before sending it. I couldn't find any Signature button, nor any with a drop-down capability for multiple Signature choices) in the Customize menu in order to do this. If not currently available, can this be added to Thunderbird? Thank you.