Comment 25 for bug 515386

Micah Gersten : I considered this as a regression because thunderbird 2.* supported this pretty well, but I would understand mozilla for refusing to fix this as it is not part of any specification (and just not necessary anyway). Robert Ancell fix seems good at a first glance.

However the second problem (thunderbird not decoding urlencoded spaces and special characters) definitively seems to be a bug that needs to be fixed in Thunderbird IMO as there are apparently no ways to have special characters or spaces in attachment filenames if thunderbird don't fix this regression. This also worked correctly in TB 2.* .

I didn't find any mention of this bugfix in 3.0.3 release notes, but I will give a try.