We are presently
requiring reverse DNS for IP addresses of MTA's which connect to our MX
(with exceptions, which are dwindling). This has nothing to do with the
MAIL FROM domain, it simply means that if you connect to us, your IP address
must have a name, and that name must map back to your IP address. What you
suggest above is exactly the sort of next step we're looking for; namely,
a DNS RR which tells the world that a particular host name has been designated
as an MTA (outgoing at least).
There are a number of us advanced/small users with home offices who presently
run our own outgoing SMTP mail server, behind a router using NAT. Not all
(valid, legitimate!) outgoing SMTP servers have fixed/permanent IP addresses.
Likewise, since I have a "residential" type high speed connection, I have
*very*
limited abilities (and that only because of my own domain names, but I don't
have my own Net-accessible DNS server in any case) to manipulate the DNS
records
associated with those domains.
I suspect that a fair number of other consultant-type users are in a similar
boat to myself on points like this. It's the needs of some of us
'advanced/small' users which the spf folks seem willing to totally ignore.
Gordon Peterson http://personal.terabites.com/
1977-2002 Twenty-fifth anniversary year of Local Area Networking!
Support the Anti-SPAM Amendment! Join at http://www.cauce.org/
12/19/98: Partisan Republicans scornfully ignore the voters they "represent".
12/09/00: the date the Republican Party took down democracy in America.
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