Here is the email
Dear Yahoo! account holder:
By creating and using your Yahoo! account, you agree to abide by
Yahoo!'s Terms of Service (TOS). Pursuant to the TOS, Yahoo! reserves
the right to terminate your account or otherwise prohibit use of your
account in the event that, among other things, Yahoo! believes that you
have violated or acted inconsistently with the letter or spirit of the
TOS.
It has come to our attention that you may have violated the TOS.
Please reread the TOS and cease any use of your account that may
violate the TOS.
If your use of your Yahoo! account is brought to our attention again,
and we believe that such use violates the TOS, then we may terminate
your account without further notice.
Please do not reply to this email. Any questions concerning Yahoo!'s
Services should be submitted through the on-line form in the help area
(
http://help.yahoo.com ).
-Yahoo!