Suggested addition to section 2, though I'm not entirely certain that "validity" is the correct word to use here:
2.3. Establishing Message Validity Though man-in-the-middle attacks are historically rare in email, it is nevertheless theoretically possible for a message to be modified during transit. An interesting side effect of the cryptographic method used by DKIM is that it is possible to be certain that a signed message (or, if l= is used, the signed portion of a message) has not been modified. If it has been changed in any way, then the message will not be verified successfully with DKIM. As described above, this validity neither lowers nor raises the level of trust associated with the message. If it was an untrustworthy message when initially sent, the verifier may be certain that the message will be equally untrustworthy upon receipt and successful verification. -- J.D. Falk Receiver Products Return Path _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
