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See RFC2821 and RFC2822
   local-part
      The maximum total length of a user name or other local-part is 64
      characters.
   domain
      The maximum total length of a domain name or number is 255
      characters.
 
> What length are you allowing for email addresses?  I can put VARLEN in the
> DDS to save space, but is there some maximum allowable email address size?
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