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216.73.216.59
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smtp2-ext.dfw1.corp.rackspace.com
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216.73.216.59
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smtp2-ext.dfw1.corp.rackspace.com
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smtp2-ext.dfw1.corp.rackspace.com has no A records.
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smtp2-ext.dfw1.corp.rackspace.com has no AAAA records.