For e-mail policy, the sender's notion is not in play. The receiver decides. <---- See that? It is a full stop. A period. The end. If the receivers decides to reject, discard, post-on-a-blog any email that contains the letter "Z". Ok. They can. If they decide that they will do the same for any email some arcane piece of header is right or wrong. OK. They can. They can even do it when someone supporting sender doesn't allow them to provide some data the receiver likes to have (Hi, Frank Ellerman!). You put whatever you like in your records. Enjoy. But you can't make people look at them. You can't tell them what to do when they read them. Writing down what they will do, and seeing if it is stupid, is better than not writing it down. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf