EXPERT RESPONSE
If you right-click the queue for this domain in Exchange System Manager and select "properties," you'll see the reason for message delivery failure listed toward the bottom of the dialog box. This will tell you why the mail has not been delivered. Some of the more common problems are DNS-related (e.g., "Unable to bind to destination server in DNS") and connection problems ("The remote server did not respond to the connection attempt").
Once you determine why the e-mail remains in the queue, you can then pursue the appropriate troubleshooting steps, such as using NSLookup to verify the MX records for ix.netcom.com. When I check those records from my location, I get the following:
ix.netcom.com MX preference = 10, mail exchanger = mx04.earthlink.net
ix.netcom.com MX preference = 10, mail exchanger = mx05.earthlink.net
ix.netcom.com MX preference = 10, mail exchanger = mx06.earthlink.net
ix.netcom.com MX preference = 10, mail exchanger = mx00.earthlink.net
ix.netcom.com MX preference = 10, mail exchanger = mx01.earthlink.net
ix.netcom.com MX preference = 10, mail exchanger = mx02.earthlink.net
ix.netcom.com MX preference = 10, mail exchanger = mx03.earthlink.net
ix.netcom.com nameserver = itchy.mindspring.net
ix.netcom.com nameserver = scratchy.mindspring.net
mx04.earthlink.net internet address = 207.217.120.249
mx05.earthlink.net internet address = 207.217.120.31
mx06.earthlink.net internet address = 207.217.120.23
mx00.earthlink.net internet address = 207.217.120.28
mx01.earthlink.net internet address = 207.217.120.29
mx02.earthlink.net internet address = 207.217.120.79
mx03.earthlink.net internet address = 207.217.120.78
itchy.mindspring.net internet address = 207.69.200.210
scratchy.mindspring.net internet address = 207.69.200.211
Your NSLookup query results should match this.
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