At 14:51 +0100 on 07/13/2005, willemien(_at_)amidatrust(_dot_)com wrote about
Re: draft-klensin-rfc2821bis-00.txt structural and textual :
section 2.3.10 has a "fuzzy" reference
"the host specified in the domain part of the address."
in general the host is NOT the domain part so what is meant by the
host specified in the domain part of the address??
The address is of the form UserID(_at_)Domain (with the "Domain Part"
being everything to the right of the @-sign). The Domain part has a
host if there are more levels than the number defined for the WhoIs
registration. If the domain is example.com but the Domain in the
address is X.SMTP.EXAMPLE.COM then X is the host in the SMTP
subdomain of domain EXAMPLE.COM.