On Fri, 14 May 2004, Jon Kyme wrote:
"Tony Finch" <dot(_at_)dotat(_dot_)at>>
On Fri, 14 May 2004, John Leslie wrote:
I find it worrysome that we're proposing things like
"v=spf1 mx -all"
meaning that the receiving MTA is expected to pull the entire list of
MX records, resolve them to IP addresses, and check whether the one
IP address of interest is in that set.
Most MTAs do this already (apart from the last step, which is a nugatory
amount of work). Why is it worrying?
When receiving mail? Are you sure?
Yes, in order to verify that the domains in the envelope addresses
actually exist. This has been a standard anti-spam technique for many
years.
--
Tony Finch <dot(_at_)dotat(_dot_)at> http://dotat.at/