On 22/11/16 14:24, Matthew Lear wrote: > I can confirm that it is indeed fixed. I'm not able to reproduce it with > the latest emacs 25 from git. Unfortunately, it seems I was too hasty in confirming this. For some reason unknown to me, replying to the html in some multipart/alternative works fine, but others cause the same error to be thrown. I've also seen the error occur when replying to a multipart/mixed message, too. Even more bizarrely, I'm currently looking at a thread with two emails where both are multipart/alternative and contain text/plain and text/html parts, and replying to the first message triggers the error/bug but replying to the second message does not. I can't see any formatting difference between the two. Sorry, but it would appear as though there is still some work needed to resolve this in it's entirety. I suppose it's likely that this could be an emacs-25 issue, but what I mentioned above makes no sense to me so I can't say for sure. I'd happily post some debug info to help analyse this if somebody could give me a few pointers about what would be needed and the emacs-fu needed to generate this. Cheers, -- Matt