That's interesting, but From is actually a mandatory header, so putting it in the SHOULD list would be redundant. (Although it shouldn't break anything.) We could have a MANDATORY list, but From seems to be the only really mandatory header.
That's interesting, but From is actually a mandatory header, so putting it in the SHOULD list would be redundant. (Although it shouldn't break anything.) We could have a MANDATORY list, but From seems to be the only really mandatory header.