Return Receipt Toolbar Button 0.20 Requires Restart
by Leszek Życzkowski
Allow you to add a Return Receipt button to mail compose window toolbar.
About this Add-on
Extension is available in 19 languages: Catalan, Czech, Chinese, Danish, Dutch, English, French, German, Italian, Japanese, Polish, Portuguese (Brazilian), Portuguese (Portugal), Russian, Serbian, Spanish (Spain), Swedish, Turkish, and Ukrainian.