今ごろになってエラーメールが返ってきた。

Subject: Returned mail: see transcript for details

The original message was received at Thu, 6 Jul 2006 01:32:31 +0900
from 略.nifty.com [略]

----- The following addresses had permanent fatal errors -----
<略@anet.ne.jp>

----- Transcript of session follows -----
<onihei@anet.ne.jp>... Deferred: Connection timed out with mail.anet.ne.jp.
Message could not be delivered for 1 day
Message will be deleted from queue
Reporting-MTA: dns; 略.nifty.com
Arrival-Date: Thu, 6 Jul 2006 01:32:31 +0900

Final-Recipient: RFC822; 略@anet.ne.jp
Action: failed
Status: 4.4.7
Remote-MTA: DNS; mail.anet.ne.jp
Last-Attempt-Date: Fri, 7 Jul 2006 01:41:29 +0900