Here is how to install the necessary packages.
Here is the list of packages that you will need to install. The version and release numbers are the earliest ones that will be required for this operation.
amavisd-new-2.3.3-1.i686.rpm
clamav-0.88-1.i686.rpm
perl-Archive-Tar-1.26-1.i686.rpm
perl-Archive-Zip-1.16-1.i686.rpm
perl-BerkeleyDB-0.27-1.i686.rpm
perl-Compress-Zlib-1.41-1.i686.rpm
perl-Convert-BinHex-1.119-1.i686.rpm
perl-Convert-TNEF-0.17-1.i686.rpm
perl-Convert-UUlib-1.06-1.i686.rpm
perl-Digest-SHA1-2.10-1.i686.rpm
perl-IO-stringy-2.110-1.i686.rpm
perl-MIME-Base64-3.07-1.i686.rpm
perl-MIME-tools-5.419-1.i686.rpm
perl-MailTools-1.71-1.i686.rpm
perl-Net-DNS-0.48-1.i686.rpm
perl-Net-Server-0.90-1.i686.rpm
perl-Unix-Syslog-0.100-1.i686.rpm
spamassassin-3.1.0-1.i686.rpm
To download these packages to your server follow the instructions found at http://wiki.engardelinux.org/index.php/Extra_Packages .Use the "apt-get install PACKAGENAME" to do the actual download.