vesely at tana
Feb 6, 2009, 10:02 AM
Post #1 of 1
(1031 views)
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FYI: Vouch by Reference, yet another use for SPF
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Although its intended use is DKIM, VBR
http://en.wikipedia.org/wiki/Vouch_by_Reference allows SPF as a means
to identify that a mail message originates from a given domain. In the
draft's words:
When SPF is the validation mechanism, VBR's md= MUST be the same
value as the domain name in the <reverse-path> address that is the
first parameter to the SMTP MAIL command.
A domain is valid for use with VBR only when the SPF process
produces a "pass" result.
Briefly, VBR provides for a list (mv=) of certifiers, i.e. third
parties offering vouch-for services. If example.net is one such
operator, a DNS record like
example.com._vouch.example.net. IN TXT "all"
would certify all mail from example.com. In that case headers like
Return-Path: <someone [at] example>
Received-SPF: pass SPF=MAILFROM;
...
VBR-Info: md=example.com; mc=transaction;
mv=example.net:another.example;
will validate the message, if the recipient trusts example.net.
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