Rated 3 out of 5 stars

This only works on one image. If you attach multiple images, only the last image is resized. Also, when multiple images are attached, the size of the e-mail does not adjust properly. If I have 3 images at 4mb each, even if one of the images is resized to 50kb, the e-mail size stays at 12mb? It stays the same size as if all three images were still full size? This isn't very useful since I can already use Windows 7 to send a single photo to Thunderbird resized. I need a program that will resize multiple photos within Thunderbird. I hope you can fix this!

This review is for a previous version of the add-on (2.0). 

Sorry for the hassle it caused. I've finally had time to look into it. Version 2.0.1 contains the fix.