ClamAV and Mail Server .NET

First, let us get ClamAV working on the server computer:

Download ClamAV by SOSDG (4.2 MB);
Run downloaded executable file, make sure to select Contributed Tools when selecting install options (by default it is NOT selected), also you may want to uncheck ClamAV Virus Test Files to avoid warnings from your other antiviruses, when they detect test viruses...

Install the package in the default directory (c:\clamav-devel\). I tried drive D, but it had certain configuration reading problems. I guess, it is better to keep it on drive C;
Go to the folder c:\clamav-devel\thirdparty\RunClamd\, go to DOS prompt, and execute following command:
```
                runclamd -install
            
```
It will install the ClamAV scanner as a windows service. It is important to have it running as a daemon, because otherwise virus scanning is really slow, engine has to be loaded and unloded each time mail goes through your server (If you do not see runclamd utility, it means, you did not check Contributed Tools option when installing ClamAV - see above);

Run Services from Control Panel - Administrative Tools, find the service Run Clamd, make its startup type Automatic (Properties dialog), so that it starts up itself when windows reboots, and start it;

Now we are ready to enable ClamAV in our mail server:

Run mail server UI;
Go to Security - Anti Spam - AntiVirus - ClamAV Antivirus, enable antivirus, and along with other options specify the path to the ClamAV (by default, it is c:\clamav-devel\).

Now you are safe... Don't forget to run freshclam.exe utility in c:\clamav-devel\bin directory to keep your virus definitions up to date!