Installing ClamAV with MailScanner

Installing ClamAV is fairly straightforward*:

• If you would like to verify ClamAV's digital signatures on the virus definition files as they are updated through freshclam, you need to install GMP first:
  /scripts/ensurerpm gmp gmp-devel
• Next you will need to create a user for clamav to use:
  useradd clamav
  Some OS's require you to add the group as well:
  groupadd clamav
  Don't worry if the user and/or group already exist.
• Download the latest stable ClamAV distribution from http://www.clamav.net
• Expand the distribution and cd into the resultant directory and build ClamAV using:
  tar -xzf clamav-*
  cd clamav*
  ./configure --disable-zlib-vcheck
  make
  make install
• Comment out the line (put a # as the first character on the line) near the top that says simply:
  pico -w /usr/local/etc/freshclam.conf
  Example
• Comment out the line (put a # as the first character on the line) near the top that says simply:
  pico -w /usr/local/etc/clamd.conf
  Example
• Run freshclam to download the latest definitions:
  freshclam
• Create an empty log file for clamav updates:
  touch /var/log/clam-update.log
  chown clamav:clamav /var/log/clam-update.log
• At this point you can setup ClamAV only in:
  pico -w /usr/mailscanner/etc/MailScanner.conf
  Virus Scanners = clamav
• Then restart MailScanner with:
  service MailScanner restart
• Or you can install the more efficient Mail::ClamAV module. You'll need to install some perl modules first (all on one line):
  /scripts/perlinstaller --force Compress::Raw::Zlib
  /scripts/perlinstaller --force Scalar::Util Net::CIDR Archive::Zip Compress::Zlib Convert::BinHex Inline::C Time::HiRes Digest::SHA1 IO::Zlib Net::IP
  
• Then install the ClamAV perl module:
  /scripts/perlinstaller --force Mail::ClamAV
• Then setup clamavmodule:
  pico -w /usr/mailscanner/etc/MailScanner.conf
  Virus Scanners = clamavmodule
• Then restart MailScanner with:
  service MailScanner restart
• You can now set what domains you want scanned for viruses in:
  /usr/mailscanner/etc/rules/virus.scanning.rules

That's it. If you don't feel confident doing any of this yourself, or if you get into a horrible mess, we offer a cheap package to do it all for you, and more, over here.

*Remember that adding virus scanning of emails to MailScanner will add load to your server.