My E-mail Contacts Are Getting E-mails That I Didnt Send.... How Do I Stop This?

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• What are the features of All-New Mail and Classic Mail? | Yahoo! Mail Classic Help
  ...multiple categories, fix duplicate entries and get updates to any contact card changes automatically. Add... big files without having to send multiple messages. Access to Yahoo! Mail, anytime, anywhere. ...-up or a slower Internet connection. Access Yahoo! Mail offline with desktop email applications such as... you to forward messages that come to your Yahoo! Mail Plus account to another email address-even...
• What is "Contacts" in the left-side folder list? | Yahoo! Mail Help
  ...;Contacts" in the left-side folder list? Yahoo! Mail Contacts is your online address book. Use it to store contact information for friends, family, and your professional network... like Yahoo! Maps or Yahoo! Yellow Pages to find a contact's location or find businesses and attractions located near... also gives you distribution listsR12;an easy way to send emails to up to 100 people at once.
• What are the features of All-New Mail and Classic Mail? | Yahoo! Mail Help
  ...multiple categories, fix duplicate entries and get updates to any contact card changes automatically. Add... big files without having to send multiple messages. Access to Yahoo! Mail, anytime, anywhere. ...-up or a slower Internet connection. Access Yahoo! Mail offline with desktop email applications such as... you to forward messages that come to your Yahoo! Mail Plus account to another email address-even...