[exim-dev] [Bug 485] Exim mistakenly prohibits underscore (_…

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Συντάκτης: bug485
Ημερομηνία:  
Προς: exim-dev
Αντικείμενο: [exim-dev] [Bug 485] Exim mistakenly prohibits underscore (_) in /HELO/EHLO commands
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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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