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Constantine A. Murenin wrote:
Julian Mehnle wrote:
Julian Mehnle wrote:
Alternatively, DynDNS.org could extend their services and publish
such an "A" record for their customers, for instance under the domain
"_spf.customers.dyndns.org". Then you could use "exists:%{ir}._spf.
customers.dyndns.org" instead.
Uhm, that would have to read "_spf.<dyndns-user-id>.customers.dyndns.
org", in order for each user to have his own "box" of IP address
"slots", with only one "A" record each (matching that exact user's
current dynamic IP address).
That would always exist, and any mail from anyone would pass. :-)
No, it wouldn't. Only "<user's-current-ip-address-in-reverse._spf.
<user-id>.customers.dyndns.org" would exist.
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