Who is the intended recipient? Since it's a Yahoo (i.e. spam central) account it's not particularly surprising that something went wrong, but if your account got "hacked" it's due to a weak password and/or weak security questions.
Agreed. Since Yahoo has a web-based interface, it doesn't necessarily imply that the mail app is compromised, since a web bot can send mail on its own if your password was compromised. Change your PW right away and see if the problem stops.
As an added precaution to make sure a future incident would be isolated, I also went into the preferences and told the service to stop saving e-mail addresses I've contacted in the online address book, then deleted the addresses in the online address book.
How do I go about doing this?
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I'm not sending these e-mails; someone or something else is doing it.![]()