>The RFC excerpts quoted there, as I read them, say that it is compliant
>to send such mail.  They do not say that it is non-compliant to
>refuse to accept such mail (although the FAQ itself makes the claim).

I think if you read the RFC it will become evident that the author
meant that it had to be acceptable on both the sending and receiving
ends.  The excerpts in the FAQ aren't the whole story.

Nathan