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Sendmail won't deliver mail to one local domain, others okay
Problem:
This problem may be caused by incorrect DNS setup and can be very tricky to spot.
 
Solution:
Use NSLOOKUP and check the zone for setup similar to this:
"ole.as 86400 IN MX 10 cobalt3.nsn.no
mail.ole.as 86400 IN CNAME cobalt3.nsn.no"

The CNAME record causes sendmail to fail, even though mail.ole.as is NOT listed as an MX host. Change to:
"ole.as 86400 IN MX 10 cobalt3.nsn.no
mail.ole.as 86400 IN A 195.159.62.37"


 
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