Do NOT post binaries to the comp.sys.mac.games groups.  The best way to
release your game to the csm.gamers is to make it available at an ftp
site and then post an announcement about it to comp.sys.mac.games with
the site name and path.  You might want to offer to email it to people
who don't have ftp access.  For the best way to send your game to
info-mac and umich, see below:

[The rest of this answer was shamelessly stolen from L.H.Wood's
 Screensaver FAQ, with permission.]

If you want to spread good Mac shareware or freeware to the world, giving
millions of people, including me, the chance to see it, simply email a
binhexed copy of the compacted or stuffited archive to:
   <macgifts@mac.archive.umich.edu>
which will distribute it to ftp archives across the world, including
the big ones - info-mac, umich, their many mirrors, and comp.binaries.mac.
Remember to add a text description of the contents before that long binhex
column!

Don't send self-extracting archives (SEAs) - Compact Pro, Stuffit Expander
and Stuffit Lite are readily available from these ftp archives, and we all
know how to use them. Dial-up access to ftp sites is on the increase and
SEAs run up others' phone bills unnecessarily.