Oh no! I've deployed a quick patch to make it stop eating those sMails ASAP. So now they will send, but the special characters will turn into question marks.

I'll leave this open - I'll try to find time to do a proper fix to support those (instead of making them question marks), but the sMail code is very old and I'm not sure if it will be possible in this case. I know we've been wanting to just rewrite it all for a while. In any case thanks for letting us know!