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Re: Sending mail from dynamic IP-addresses with dynamic PTR hostnames, but constant EHLO/HELO hostnames

2005-05-25 13:15:57
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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).
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