Edward Ned Harvey wrote:
Ok, so if I'm the owner of a mailserver and I want to use spf, I have to
manually create a list of every IP address of every mailserver that I expect
to receive email from.
Erm no, absolutely not. Almost completely backwards, I'm afraid.
What SPF specifies is the range of servers that can be expected to send
mail FROM a specific domain. The domain owner adds a record to his DNS
entries listing those servers; this listing can be as simple as "all the
servers I've got listed as incoming mail exhangers", or "all the servers
whose reverse-resolves put them in my domain", or as complex as "All the
servers in the same IP-subnet as any of my hosts, but not those that are
mail exhangers for someone-else.com".
SMTP, IMLE is almost always a one-hop operation; in cases where it's
not, (ie smarthosting), most of the servers in a chain are under the
same control anyway.
HTH,
Wechsler
--
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