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.
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