Filtering outgoing messages on DNS names or local-part structure
I recently posted draft-klensin-name-filters-01.txt as an I-D.
It addresses the issues raised by web sites thinking they know
all of the top-level domain names (so that, e.g., forms that
specify domains of ".museum" or ".aero" are rejected as invalid)
and by various applications that are convinced they know the
valid formats of email local-parts and hence reject
foo+bar(_at_)domain, bar/baz(_at_)domain, and a series of other things as
It is just an analysis and reprise of existing standards, and
doesn't propose any new standards. The hope is that, by drawing
things together into one place, we might have something easy to
point to and get a bit more conformance.