In <200601111353(_dot_)53403(_dot_)lists(_at_)email(_dot_)fries(_dot_)net>
"Todd T. Fries" <lists(_at_)email(_dot_)fries(_dot_)net> writes:
am I blind or is there a need for 'aaaa' ? or does 'a' work for 'aaaa' ?
The SPF "a:" mechanism works for both A and AAAA records.
From section 5. "Mechanism Definitions":
When any mechanism fetches host addresses to compare with <ip>, when
<ip> is an IPv4 address, A records are fetched, when <ip> is an IPv6
address, AAAA records are fetched. Even if the SMTP connection is
via IPv6, an IPv4-mapped IPv6 IP address (see [RFC3513] section
2.5.5) MUST still be considered an IPv4 address.
I put an 'a:' in my domain and occaid rejected my mail when my mail server
attempted to send to them using v6 ;-(
So, if you are connecting via IPv6, SPF implmentations are supposed to
look up AAAA records when they find an "a:" mechanism. (Actually,
they also need to do that for "mx" too.)
Does this answer your question?
-wayne
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