If you are often sending out emails with the same subject line, you may find Subject Manager for Thunderbird helpful in this regard. The extension for the desktop email client not only enables you to save and select subjects manually, but also to define a default subject that is automatically entered into the subject field.
You will notice the new subjects button next to the subject line on the compose email window after installation. A click opens a menu that lets you save or clear subjects, or select one of the previously saved email subjects to use it in that email.
New subjects that you add this way are automatically appended at the end of the list. You need to open the settings of the Subject Manager extension if you want to modify the order of subjects. Here you can also add subjects manually without having to open the compose window to do so.
The settings provide access to several features of the extension, including:
Subject Manager for Thunderbird is a versatile extension. I'd like to see an option to define custom default subjects for each account that you have configured in the program. Other than that it is near perfect for users who use email subjects over and over again.
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