many subscribers to this list have been removed

You absolutely cannot bounce back at me, the list owner, simply
because your site is too damn stupid to accept ISO-2022-JP-2
encoded postings.

I refuse to get bombed with bounces from your site just because
your broken email installation refuses to accept postings encoded
in that completely valid character set.

I sort of quietly tolerated this garbage in the past, but it's
a losing game, and people simply need to fix their kit.

If you want to not accept any email encoding in that character
set, that is YOUR business, but once you make such emails
generate a bounce back to the sender (that's me) then it's MY
business.

So people at these sites have two choices 1) turn off the filter or
2) make it quietly drop and not emit a bounce back to the sender.