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However, all is not lost! Shortly after I created this plugin, the developers added a hidden option to the advanced options that will allow you to configure it to stop ignoring the reply-to header!
Go to the "Tools" menu, and under "Options", select "Advanced". Choose the "General" tab. At the bottom, you'll see a button that says "Config Editor..." If you click it, it will probably pop up a box that says "This might void your warranty!" Click the button that says "I accept the risk!"
Search for the one called "mail.override_list_reply_to". Double click it to Change it to "false".
One of these days, I plan on fixing this plugin so it works again. But until that day, know that this option is available.