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

Request Review of draft-ietf-spfbis-4408bis
Requested rev. 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
Draft 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
Review review-ietf-spfbis-4408bis-14-secdir-early-hallam-baker-2013-05-02
Reviewed rev. 14 (document currently at 21)
Review result Has Nits
Review 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 positives.

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.