[plamo:09598] Underivered Mail

[FUJII Hiroyuki]

ＭＬを見る限り、送られているはずのメールが、
Underivered Mail Returnd to Sender という件名で、

以下のような本文とともに帰ってきます。
どうなっているのでしょうか

===============以下引用===================

This is the Postfix program at host MkIII.alfumien.allnet.ne.jp.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please contact <postmaster@alfumien.allnet.ne.jp>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

The Postfix program

<fumi@localhost.alfumien.allnet.ne.jp>: maildir delivery failed: create
    /home/fumi/Maildir/tmp/987744012.28507_1.MkIII.alfumien.allnet.ne.jp:
    Unknown error 125

==================以上======================