Unwanted emails (spam) often carry malware waiting for a chance to infect your clients' PC. Viruses, Trojans or Worms spawn new variants on an hourly basis. Phishing emails pose an additional threat: senders try to gain the trust of recipients and goad them into sharing important data (such as login information, bank account data etc.).
Even emails of known and trusted senders might be unsafe. The newspapers are full of botnets spanning the globe using one personal computer or server to infect other systems.
Often the content of a malware-carrying email is designed to make the recipient open an attached document. If the seemingly harmless file is opened and the local antivirus software fails to recognize the threat, the computer is infected with whatever malware the email carried.
How can I protect my computer from viruses and other malware?
At the end of the day there are only two workable antivirus strategies:
1. Be careful, stay alert!
Never open attachments of spam emails, never open attachments that provide even the tiniest sign of mistrust: a notice of income tax assessment attached to a typo-ridden email? Fake! A booking confirmation for a flight you never wanted to take? Don't open the file, simply call the airline directly (get their number off their official page, just to be safe)! An overdue notice for wares you never ordered? Contact the person you - allegedly - owe money to instead of clicking on the attachment.
It all boils down to this: think twice before you open any attached file.
2. Install powerful antivirus software - for example ClamAV!
Antivirus software should be installed on each and every computer. The optimal antivirus solution for Exchange Server, however, is this: your server refuses to collect the email and it will never reach the users' inboxes or - at least - the server informs users about the possible dangers the mail might pose.
The well-known antivirus software ClamAV is pre-installed on Exchange Server Toolbox. The program is kept up to date and doesn't allow any security gaps. ClamAV supports the direct refusal of infected emails (Exchange Server 2007 or higher). Another benefit of this antispam strategy: the email was never accepted and thus does not have to be stored in your email archive. The sender is informed why his email was not delivered and can take measures against the malware on his system.
To guarantee optimal protection we recommend you connect a second antivirus software to Exchange Server Toolbox in addition to the pre-installed ClamAV. Please refer to our online manual for further information.
How does ClamAV for Exchange Server work?
ClamAV is an open source antivirus software used on many servers (mainly Unix/Linux systems). The integrated software offers high-performance multithread scans and is integrated into the Exchange Server rule system. Once an email has been marked as dangerous, the rule processes it according to the predefined actions (e.g. mark it as spam, delete it, or refuse it).
Exchange Server Toolbox protects your inbox.