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Early Review of draft-ietf-spfbis-4408bis-14

Request Review of draft-ietf-spfbis-4408bis
Requested revision No specific revision (document currently at 21)
Type Early Review
Team Security Area Directorate (secdir)
Deadline 2013-09-24
Requested 2013-04-19
Authors Scott Kitterman
I-D last updated 2013-05-02
Completed reviews Genart Last Call review of -19 by Meral Shirazipour (diff)
Genart Telechat review of -20 by Meral Shirazipour (diff)
Secdir Early review of -14 by Phillip Hallam-Baker (diff)
Secdir Last Call review of -19 by Phillip Hallam-Baker (diff)
Assignment Reviewer Phillip Hallam-Baker
State Completed
Request Early review on draft-ietf-spfbis-4408bis by Security Area Directorate Assigned
Reviewed revision 14 (document currently at 21)
Result Has nits
Completed 2013-05-02
I have reviewed this document as part of the security directorate's

ongoing effort to review all IETF documents being processed by the

IESG.  These comments were written primarily for the benefit of the

security area directors.  Document editors and WG chairs should treat

these comments just like any other last call comments.

The document is clear and describes the SPF mechanism effectively. The only
quibble that I could find is that repeated mentions are made of limiting the
number of 'DNS queries' without specifying whether these are individual queries
or recursive. The count will come out rather differently if looking up TXT/

 counts as one lookup or three. I think it is reasonably clear that this is one
 but could not find an explicit statement to that effect.

On the security side, the document addresses all the mail issues that I can
remember at this point and rather more besides.

I think we have reached the point of diminishing returns.

The document provides a clear enough warning to people configuring SPF records
as to the consequences of getting it wrong which is the main concern. The
filtering services will know their business well enough to minimize false

Hopefully the email infrastructure will evolve over time towards concentrating
on the more policy friendly approaches and it will be possible to simplify the
mechanism at a future date.