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Outlook and Attachment Security

Outlook and Attachment Security Some of most common attachments you receive, such as JPG and GIF images, are entirely safe. Others, such as Word or Excel documents, are usually safe but could carry macro viruses | Team LiB Outlook and Attachment Security Some of most common attachments you receive such as JPG and GIF images are entirely safe. Others such as Word or Excel documents are usually safe but could carry macro viruses. Other attachments including those with .exe js and .pif extensions might be safe but they re just as often viruses. Because it s impossible to know for sure it s important that you not only install a virus scanner but also use its autoprotect feature and keep the virus signatures current. You should never open files you aren t expecting even if your antivirus scanner gives them a clean bill of health the virus might be too new to be in your virus definitions. Just in case you re lax when it comes to keeping your antivirus scanner up-to-date Outlook offers some built-in protection against email viruses including blocking all file types that have the potential to carry viruses and are executable. Although you can unblock any or all the file types you should unblock only the file types that you really do need or use other methods to retrieve the attachments. Many corporate firewalls block the same extensions that Outlook blocks and you might have to change the extension or zip the file before sending attachments to some contacts. If you d like all of your attachments zipped before sending look for ZipOut the WinZip Outlook add-in or other utilities at http www.slipstick.com. When you send blocked file types as attachments you should get in the habit of changing file extensions to a safe nonexecutable type or zipping the file. Outlook 2003 won t warn you when you attach a blocked file type but it will warn you before you send it as shown in Figure 6.5. Choose No zip or add an underscore to the filename and then reattach. This ensures that the person you send it to can access it also. Figure 6.5. When you send attachments that could carry viruses Outlook alerts you before sending. If you edited your Registry to allow some file types you won t see the .