Underscores in host names

Thu May 19 04:55:25 UTC 2005

On Wed, 18 May 2005, David A. Ulevitch wrote:

> .ws has an MX record.
> host -t mx ws. ==> mail.worldsite.ws
>
> Most MUA's (unix ones tended to work, not surprisingly) complain or break
> on "send" but technically it works. :)

Read 2.3.5 of RFC2821 and note that "A domain (or domain name) consists of 
one or more dot-separated components"

So technically its not supposed to work, but not everyone is compliant 
with standards...

-- 
William Leibzon
Elan Networks
william at elan.net