On October 11, 2005 at 21:50, "Hallam-Baker, Phillip" wrote: > I have a DKIM-SL client that is designed to add an end user signature. How to you distinquish between an end-user signature and a signature created by a gateway? I.e. How does a DKIM verifier know for sure that a given signature was created by the end-user versus some other entity? --ewh