[Exim] Blocking empty mime boundaries

Anybody know if there's ever a valid reason for having an empty mime
boundary? I was going to add an acl data rule to block such messages,
since it can be used to bypass mail scanners and it doesn't seem likely
that such mail would ever be kosher, but I thought I'd check with the
local knowledge pool.

--
Bruce

Hummingbirds are the only birds that can fly backwards, apart from
ostriches if you punch them hard enough.