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Lyman said: > I'm familiar with <draft-klensin-rfc2821bis-10.txt> and understand > the importance of using only FQDNs in SMTP exchanges given that "[i]n > the case of a top-level domain used by itself in an email address, a > single string is used without any dots." What I'm interested in is > any reason to proscribe the use of a TLD as a single label hostname > (particularly for email addresses) other than the fact that there is > software out there that will interpret it incorrectly - Potential problems with global use of single-label names go beyond SMTP. For example, RFC 4282, which defines the Network Access Identifier (NAI), does not permit the use of single-label names. From Section 2.1: realm = 1*( label "." ) label As a result, someone purchasing the "example" TLD and using the NAI bob at example in order to obtain access to the network, might well discover that this would not work. |
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