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What a bad luck. Note that it doesn't mean that your iMac is unsafe, because there may have been an attack to your mail provider and your password might be stolen. Change the password now.
Then, OS X has got its own security systems, so you shouldn't need any other security application. As I think you are a bit frightened, you can install an antivirus like ClamXav or Sophos, but they won't do anything incredible. Maybe Little Snitch would be better, because you can control all the processes that connects to Internet. Finally, read > http://www.thesafemac.com/mmg
You may find this User Tip on Viruses, Trojan Detection and Removal, as well as general Internet Security and Privacy, useful: The User Tip seeks to offer guidance on the main security threats and how to avoid them.
Your email nbeing hacked has nothing to do with your mac. It is probably being done through the web interface from your email provider. If it is Yahoo this seems to be fairly common. Installing anti virus software on the mac won't stop this from happening.
We just got our new computer and noticed there is no virus program installed.
Actually, there is, you just can't see it since it's part of OS X and runs in the background. It consists of the GateKeeper which will prevent you from running unapproved applications as long as you don't disable it; XProtect which will detect most common malware when you first download it; Quarantine which will give you a warning when you launch most new application that it came from the internet; and the Malware Removal Tool which runs each time you install an OS Security or Java update and will look for commonly installed malware and notify you of anything it found and deleted.
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