Thunderbird sets the automatic signature and reference location for email replies.

Thunderbird sets the automatic signature at email reply and the location referenced by the email. By default, Thunderbird replies or replies to emails. The reply content and signature are at the bottom of the email content, this is different from foxmail on windows. You can set www.2cto.com as follows and select "Edit"> "Account Settings"> current Account> "Manage Identities" in the lower right corner. pop-up
Select "Edit" in the dialog box, select the tab "Composition & Addressing" and select "Automatically quote the original message when replying", then "start my reply
Above the quote "and place my signature" below my reply (above the quote )"