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http://www.exim.org/bugzilla/show_bug.cgi?id=485
------- Comment #5 from ph10@??? 2007-03-19 09:44 -------
On Sun, 18 Mar 2007, bugzilla.exim.org@??? wrote:
> It's not a huge deal either way. I have it working now. I should point
> out that to really enforce strict FQDN syntax, the first character of a
> label can only be a letter and the last can only be a letter or digit.
> The first character cannot be a digit or hyphen, nor can the last be a
> hyphen. 3com.com is not a syntactically correct FQDN and should be
> rejected as such ;-) RFC 1035 Section 2.3.1
Sigh.
RFC1123 APPLICATIONS LAYER -- GENERAL October 1989
2. GENERAL ISSUES
This section contains general requirements that may be applicable to
all application-layer protocols.
2.1 Host Names and Numbers
The syntax of a legal Internet host name was specified in RFC-952
[DNS:4]. One aspect of host name syntax is hereby changed: the
restriction on the first character is relaxed to allow either a
letter or a digit. Host software MUST support this more liberal
syntax.
Philip
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