>Anyway, I had a node ESCAPE.COM which had a user on my list.  This morning,
>mail started bouncing for the user saying "unknown user".  I let it go and
>by the afternoon the bounces started saying "node does not exist" or something
>like that.  When I sent a test message it bounced, saying my system has
>no knowledge of ESCAPE.COM (even though it existed only yesterday).
 
The problem is that one of the two authoritative names servers
is FUBAR.  Namely ns.uu.net is "resolving" escape.com to the
non-existant escape.com.com MX host.
 
The other DNS, escape.com does resolves it correctly.  Thus, depending
upon which DNS is available/used, it will/will not resolve properly.
 
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