I sent a message to bugs@darcs.net on January 29th (subject: test failure in 
pull.pl on AFS) and got no response, nor did an issue show up here. (I later 
created that issue here through the web interface.)

This happened to me too, twice.  Mail sent from simonmar@microsoft.com.

I'm leaving this open, since I haven't got a clue why some emails are being
dropped by bugs@darcs.net.  At some stage, if you could both retry by sending
test bugs, that would be great.  But I'm soon to leave for an interview, so
right now I don't have much time to look at mail logs.  A quick look doesn't
show anything suspicious.

David.

FWIW, it seems this is still happening.  Simon Peyton Jones submitted two
reports recently, and it seems they both got dropped on the floor.  Mail from
simonpj@microsoft.com.  We're happy to work with anyone who is interested in
tracking this down.  For now I'll submit his bugs from a different address or
file them directly.

There wasn't any moderator checking the bugs filter, which holds messages by
people who haven't successfully emailed bugs before.  Silly me.  I'm very sorry
about this!

David

zooko said something like 
"My co-worker robk@xxxxxxxxx.com submitted a bug report on Apr 5, Subject 
"gripe:
hangs", and it disappeared into the void.  He resent an hour ago and the resend
also appears to have disappeared."
I would rather not have my email address 'public' on the web.