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Re: Does this address really violate RFC822?

The trailing dot on JCASTON.@ is illegal.

See RFC822 section 6.1. SYNTAX:

     addr-spec   =  local-part "@" domain        ; global address
     local-part  =  word *("." word)             ; uninterpreted

If you have a ".", then you must have a word following it.

     atom        =  1*<any CHAR except specials, SPACE and CTLs>
     word        =  atom / quoted-string

and atom's must be at least one character (or ""), therefore the "empty" word
following the dot is illegal.