The document 'RFC733 STANDARD' is available on NICSERVE. Basically, it is very similar to RFC822, but it permits the word 'at' instead of '@' in mailbox names. Admittedly, providing for RFC733 is a throwback, but I personally have received RFC733 mail more than once in the past year from non-IBM NOTE senders. Naturally, the viewpoint of a Mail User Agent maintainer is different from that of a LISTSERV maintainer (if my program can't reply to a message, then I am directly inconvenienced), so I can't really argue that LISTSERV should make *any* concessions to NOTE -- the pedagogical value of disenfranchizing all NOTE users would be immense, provided, of course, that you could stand the heat from said NOTE users. John