william(at)elan.net wrote:
On Mon, 18 Jul 2005, Michael Thomas wrote:
d's utility is when you consider subdomains. That is, with
"i=mike(_at_)a(_dot_)b(_dot_)c(_dot_)d(_dot_)example(_dot_)com; d=example.com", you only need
to populate the subdomain _domainkey.example.com, and not
every valid subdomain as well (eg, _domainkey.a.b.c.d.example.com)
How common is this really in email? There are lots of subdomains, but
in practice almost none are used in email and those that are used are
likely coming from separate MTA systems.
If you're asking for statistics, I don't know, but I have certainly seen
quite a number of times when subdomains are present -- corporate
divisions, university departments, and government departments, to name a
few. Some of them use the same mail infrastructure. The complexity
involved here is quite small; is there some reason this should not be
accommodated?
-Jim