Phil White wrote:
Except that SPF oesn't deliver mail at all - it is simply a query mechanism
for the MTA to interrogate if it wishes to do so. Though the _smtp_client
domain name will never be part of the the email address, nevertheless, the
query will be used within the SMTP process.
>
Note that the objection relates only to using the _smtp_client with the TXT
RR. If SPF follows the SRV RR route, and it uses LDAP, then other 'standards'
apply.
So the SRV RFCs can dictate the policy of domain names when you look up
the _smtp._tcp.example.com SRV record, which should happen during the
delivery process if I'm not mistaken.
What is it about SPF doing a lookup on _smtp_client.example.com that
makes it different?
--Jonathan Steinert
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