Or better yet, go to the service provider and they make take action.

Well... at least it will slow them down for awhile, especially if it
happens to be the good folks at Yahoo in the UK:

>>> "Yahoo! Communities Team UKIE" <[log in to unmask]> 11/05 3:54 AM >>>

Hi

Thanks for your email

Thank you for reporting this to Yahoo!  It is prohibited to send unsolicited
or 'spam' email from a Yahoo! Mail account as agreed by new users when
accepting the Yahoo! Terms of Mail Service Agreement.

In this particular case, we have identified the account used to send this
email and have taken the appropriate action to prevent it from being used
again to send spam mail.

In the future, if you receive an unwanted email message that appears to
originate from a Yahoo! Mail account, please forward the message with full
headers directly to us at [log in to unmask]

Thank you for working with us to keep Yahoo! a friendly email environment.

Regards

Yahoo! Customer Care

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