SPF (Sender Policy Framework) discussion list

Alessandro Vesely | 6 Feb 2009 19:02

FYI: Vouch by Reference, yet another use for SPF

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.com>
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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spf-discuss | 8 Feb 2009 07:00

SPF Mail Summary Report

                    iMail News Gateway Server v3.1                    
          (c) Copyright 1996-2005 Santronics Software, Inc.           

                        Mail Forum Statistics                         
                Date Range : 04 Feb 2009 - 06 Feb 2009
                Report Date: 08 Feb 2009

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Total Summary:
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Total Forums          : 2
Total Messages        : 24
Total Participants    : 8
Total Vendor Postings : 0
Total Mail/No Replies : 2  (8%)
          6+ Days Old : 0    4+ Days Old: 0
          2+ Days Old : 1    1 Day Old  : 1
Busiest Posting Hour  : 10am  (9 msgs)
Busiest Posting Day   : Thursday  (12 msgs)

+-[ Hourly Posting Pattern ]----------------------+
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spf-discuss | 22 Feb 2009 07:00

SPF Mail Summary Report

                    iMail News Gateway Server v3.1                    
          (c) Copyright 1996-2005 Santronics Software, Inc.           

                        Mail Forum Statistics                         
                Date Range : 16 Feb 2009 - 18 Feb 2009
                Report Date: 22 Feb 2009

----------------------------------------------------------------------
Total Summary:
----------------------------------------------------------------------

Total Forums          : 2
Total Messages        : 5
Total Participants    : 5
Total Vendor Postings : 0
Total Mail/No Replies : 1  (20%)
          6+ Days Old : 0    4+ Days Old: 0
          2+ Days Old : 1    1 Day Old  : 0
Busiest Posting Hour  : 9am  (3 msgs)
Busiest Posting Day   : Monday  (4 msgs)

+-[ Hourly Posting Pattern ]----------------------+
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