migrate@2ch.net にメールを送ったんだけど返ってくる

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The original message was received at Fri, 9 May 2014 18:02:02 +0900 (JST)
from xxx.xxx.ne.jp [xxx.xxx.xxx.xxx]

----- The following addresses had permanent fatal errors -----
<migrate@2ch.net>

----- Transcript of session follows -----
<migrate@2ch.net>... Deferred: Name server: 2ch.net.: host name lookup failure
Message could not be delivered for 5 days
Message will be deleted from queue

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さて、どうしたものか。。。