Post by Glyph LefkowitzThe answer should be "no", I believe it will bounce.
Oops! Mail delivery retries to the rescue :).
Aside from an extremely exciting hour where I accidentally created a suppression for my own address and could not test anything, this went reasonably smoothly. (Those who might want to help us out with ops: we now exclusively use exim for routing messages to mailman, and maybe delivering some emails from Trac; it no longer sends messages to users. So we could maybe make a Docker container out of that.)
-glyph