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Re: Exim not accepting undescore in server name?

On Tue, Jan 17, 2006 at 02:14:44AM -0700, Michael Loftis wrote:
> The unfortunate reality is that because the DNS implementations have never 
> expressly forbidden _'s we have to allow sending and receiving to/from 
> hostnames with _'s.  

Why should DNS dictate what is acceptable for email?  DNS is designed
to be more general than email, or web, or even IP.

Underscores are not acceptable in internet hostnames as per STD13
and RFC1035.  If people choose to do this they will experience
breakage all over, from stricter OS resolver libraries, to
application proxies (squid!).  Giving in to their wishes in this
regard does not ultimately help them, it's a rocket launcher with
foot-seeking missiles.

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