[olug] disable the default search domain?

[Ryan Stille]

We have a DNS wildcard here.  This is affecting my sendmail box.  When 
it tries to send mail to an invalid domain, such as foox123.com, the DNS 
lookup initially fails, but then it tries foox123.com.mydomain.com and 
it gets back an IP (because of the dns wildcard).   So the message says 
in the queue for days while it tries to deliver that message to a server 
that's not a mail server.

To be clear - I don't have any "search x" lines in my resolv.conf file.  
Its happening because the machine's domain name is a search domain by 
default.   I haven't found a way to disable this, other than to change 
the hostname to be "machinename" instead of "machinename.mydomain.com".  
I'm not sure what else that might screw up.  Any ideas?

-Ryan