Rated 5 out of 5 stars

Από τον/την Guillaume στις Δεκ. 13, 2011 · μόνιμος σύνδεσμος

Very nice extension, you need to update the configuration of Thunderbird mailnews.sendInBackground : true, and you have a real send in background just as in Outlook!
But this extension needs to be updated by the owner :(