This mail is sent to the registration mail 
address or the Yahoo! mail address. It is Yahoo! 
although it is trouble when there are a case 
where there is no idea in this mail, and an 
unknown point. Please contact me by the reply of 
this mail after surely adding JAPAN ID in 
writing. 
**************************************************
***** Yahoo! It is JAPAN member service. It is 
always Yahoo!. Thank you for using service of 
JAPAN. Yahoo! The incident for which the password 
of JAPAN ID is used by stealth does not sever the 
back. A password is as important as the personal 
identification number at the time of drawing out 
cash in a bank. Yahoo! I ask you to confirm once 
again about password management of JAPAN ID. It 
is Yahoo! to others. If the password of JAPAN ID 
is known, it will be freely sent and awarded by 
its ID at a Yahoo! auction, or damage -- Yahoo! 
mail will try to steal and will be carried out -- 
will be expected.

Following Sovereign, I believe this is warning 
that you might receive a message from someone 
posing as a Yahoo! representative, asking you to 
confirm your password. You should always check 
with an authentic Yahoo! representative that this 
request is legitimate. It might be someone trying 
to hack into your account.  Giving out your 
password in response to such a request might 
allow someone else to bid in your name or 
otherwise try to harass or even steal from you.

I don't think you're being asked to confirm your 
password in response to this particular message: 
from what I can tell, the first part is just 
quoting from the bogus message that's going 
around.  Ne?