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Re: [ietf-dkim] ISSUE: SSP-01 Unnecessary constraint on i= when asserting "strict"

2007-12-05 14:53:30
On Wednesday 05 December 2007 13:36, Douglas Otis wrote:
A domain wishing to protect their transactional mail may decide to
publish "strict" to limit the acceptance of "non-compliant" messages.

Compliance now requires the i= to not include a localpart, or for the
localpart to match with the From header.

This unnecessary requirement may produce "false positive" detections
of bad acts when signing domain uses i= as intended in the base draft,
which is to indicate on who's behalf the message was signed.

Options to mitigate "false positives" would be to:

  1- Exclude the i= parameter
  2- Add another signature specifically signing the From as well

Since the signer is controlled by the same entity, option 3 would be don't 
send messages where i= doesn't match what's in From.  

Scott K
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