Thunderbird: issues with applying saved patches

I can see comments and advice on how to *send* patches using Thunderbird, but for the most part we're not attempting that (we're using "git send-email").

However, we're (by "we" I mean those of my colleagues who use Thunderbird, obviously) finding occasional issues with saving patches from Thunderbird: "git am" complains that they're corrupt.

I'm not sure that they are, but they're Quoted-printable encoded, and so perhaps not decoded quite correctly by git. Or perhaps they're invalidly encoded.

I'm not sure that I care exactly what's at fault, though I think Thunderbird ought to be able to save an article exactly as it is (it appears to be encoding it using Quoted-printable).

Anyway, I'm surprised I don't see anyone else mentioning this. Have I just missed it, or are we doing something silly (maybe there's some slightly non-obvious way of saving an article in Thunderbird)?

Could be that other people just go to the message file or something. Someone tells me that he has no problems if he moves the article from the IMAP folder to a local folder and uses that. So maybe most people just don't notice (because they're not using IMAP)?