Your company has suffered several denial-of-service attacks involving Microsoft Outlook e-mail clients. How can you protect your systems from such attacks in the future, yet still allows client users to accomplish their jobs?

A.
Install antivirus applications on the clients and the e-mail server

B.
Filter out all attachments from e-mail messages at the e-mail server

C.
Filter out all attachments from e-mail messages at the e-mail server, and install antivirus applications on the clients

D.
Install personal firewalls in the e-mail server and on each client

Explanation:
DoS attacks coming from an e-mail applications that affects the client is usually virus code that causes damage to the client system so that it is disabled. Detection of these viruses before they can do damage is critical. Using antivirus applications on the clients and the e-mail server for this detection will help prevent future attacks. Also, if possible, scanning software can also be added to the firewall or proxy server.
Incorrect Answers:
B, C: Without the attachments, client users won’t be able to still do their jobs. Those attachments can have documents or spreadsheets that those users need to process.
D: A firewall won’t help, unless it can detect and act upon any threatening code in the e-mail message payloads.
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