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Schedule: For defining when you want the latest virus definitions downloaded and when you want scheduled scans to take place.

Log Files: For setting whether or not you want log files stored and for viewing them.

Exclude Files: To specify file types you donвЂ™t want scanned.

Quarantine: For defining where you want to quarantine malicious files.

General: For setting up alerts and whether or not to scan for malware and phishing in your email messages (which is where the app found infected files on my Mac).

ClamXav offers five configuration options:

Once youвЂ™ve downloaded and opened the app youвЂ™ll want to set the appвЂ™s preferences, as the default behavior is to scan for viruses but not delete or quarantine them. YouвЂ™ll find it at the Mac App Store or you can download it directly from the ClamXav Website, where you can also make a donation. If youвЂ™re using AppleвЂ™s Server app to host your email, itвЂ™s what Apple uses to scan incoming mail for viruses.Д¬lamXav is, like AdWare Medic, donationware and it is fantastic. Why ClamXav? Because it has one job and it does it very well. While itвЂ™s unlikely that your Mac will run any malware, there is possibly a more pernicious issue: You Mac could become the Typhoid MaryВ of Windows viruses, which is to say, you could be harboring viruses on your Mac that wonвЂ™t effect you, but can be problems for Windows users.

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So itвЂ™s always best to be wise when downloading software from unknown sources. If new malware is released today and you download and run it today you will have done so before AppleвЂ™s databases could have been updated. There is no software thatвЂ™s able to catch everything. This should keep your Mac free from most malicious software, although itвЂ™s important to note that it does not make it impossible for malicious software to be installed on your Mac.

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Make sure that Automatically check for updates and Install system data files and security updates are checked.

To make sure your Mac malware database is always up to date youвЂ™ll want to verify that your Mac always automatically installs security updates and related system data files. YouвЂ™ll be met with a message offering the option to toss the app in the trash.ДЄnd this is why Macs remain mostly virus and malware free. (For software you know is good you can bypass this by control-clicking the app and selecting Open from the resulting contextual menu.)ДЄpps that are known malware cannot be opened at all.

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This system consists of the quarantine of any app downloaded from the Internet, the use of Code Signing certificates to verify that an app is coming from a legit source, and regular security updates that include databases of known malware targeting the Mac OS.Д«ecause of this system, called File Quarantine and occasionally referred to as XProtect:ДЄpps in quarantine display a dialog window reminding you where the app came from and asking whether or not youвЂ™re sure you want to open it.ДЄpps with no code signing certificate, depending on your Gatekeeper settings, may display a message saying the app canвЂ™t be opened because of your settings.

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While your Mac can definitely be infected with malware, AppleвЂ™s built-in malware detection and file quarantine capabilities are meant to make it less likely that youвЂ™ll download and run malicious software.ДЄpple introduced malware detection to the Mac OS with Snow Leopard (Mac OS 10.6).

And, to some extent, thereвЂ™s truth to that. You may have been led to believe that you donвЂ™t have to worry about computer viruses on your Mac.