How about using Dynamic DNS, authenticating the queries using TSIG?
Yes, but the original 'objection' was that domain owners that have
significant mail senders and receivers, such as yahoo.com,
would (under the
original SPF specification that only used reverse IP notation) have to
create a significant number of new DNS records to match up
with their MX
addresses. I was just suggesting a way to get around that.
In the current
specification, a directive of "mx" means that the MX records
have to be
queried.
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