Comment 5 for bug 1777349

I'll need to spin up my own test container to properly test why it ever renders correctly. I don't think browsers are actually able to figure out that the text should be decoded from UTF-8 to KOI8-R and then interpreted as UTF-8. My Firefox wasn't able to do that when I opened template source file directly.

Maybe default Debian mailman configuration somehow fixes the encoding back into something recoverable, I don't know.

Though, frankly, I don't really want to investigate why obviously broken configuration works in certain cases, when the fix is (more or less) apparent :)