On Fri, 15 Jun 2001, Rolf E. Sonneveld wrote:
: > > (1) Don't block empty envelope from:
: > > (2) Don't say ok to a recipient address if you are not 100% sure you can
: > > local delivery.
: (3) don't reject mail if you are listed as MX host
: (4) always support postmaster(_at_)domain, for all domains for which you send
: the Internet.
One interesting thing to note is that there's already a blackhole project
intended to combat some of this: it allows a MTA to autobounce mail from
RFC-ignorant domains (that is, domains for which the MXs violate either 1 or
4 above). The list is arranged as a *domain*-based (not IP-based) DNS zone.
-- Todd Vierling (tv(_at_)pobox(_dot_)com)