host -t mx hanmail.net
[root@localhost ~]$ host -t mx daum.net
daum.net. mail is handled by 10 mx1.hanmail.net.
daum.net. mail is handled by 10 mx2.hanmail.net.
daum.net. mail is handled by 10 mx3.hanmail.net.
daum.net. mail is handled by 10 mx4.hanmail.net.
daum.net. mail is handled by 10 mx5.hanmail.net.
daum.net. mail is handled by 10 mx6.hanmail.net.
daum.net. mail is handled by 10 mx7.hanmail.net.
daum.net. mail is handled by 10 mx8.hanmail.net.
daum.net. mail is handled by 10 mx9.hanmail.net.
daum.net. mail is handled by 10 mx10.hanmail.net.
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