DEPENDENCIES:

FOR SPAMASSASSIN (please install in this order): perl-Test-Pod,
perl-Encode-Detect, perl-Image-Info, perl-TimeDate, perl-Test-Simple,
perl-Net-libIDN, Net-SSLeay, perl-Socket6, perl-IO-Socket-SSL,
perl-IO-Socket-INET6, perl-Crypt-OpenSSL-Bignum, perl-Crypt-OpenSSL-Random,
perl-Crypt-OpenSSL-RSA, perl-DB-File, perl-DBI, perl-Digest-SHA,
perl-Geography-Countries, perl-IP-Country, perl-IO, perl-URI, perl-digest-sha1,
perl-digest-hmac, perl-html-tagset, perl-html-parser, perl-libnet, re2c,
libwww-perl, perl-NetAddr-IP, perl-Net-Server, perl-Net-Ident, perl-MailTools,
perl-net-ip, perl-net-dns, perl-Net-DNS-Resolver-Programmable, perl-Mail-SPF,
perl-Mail-DKIM, spamassassin

FOR AMAVISD-NEW (please install in this order): perl-Convert-TNEF,
perl-Convert-UUlib, perl-Convert-BinHex, perl-Archive-Zip, perl-IO-stringy,
perl-MIME-tools, perl-Unix-Syslog, perl-BerkeleyDB

SETUP:
1. Create amavis user/group, before running the script.
    groupadd -g 225 amavis
    useradd -d -m /var/lib/amavis -s /bin/bash -u 225 -g 225 amavis

2. Make sure you have write perms for amavis group to amavis home (in this
   case, /var/lib/amavis)

3. Create /var/log/amavisd.log file, change perms to allow write access
   to amavisd user/group.

4. Add amavis user to clamav group and set "AllowSupplementaryGroups yes"
   in fresclam.conf to allow amavis to scan messages.

5. To scan messages using spamassassin, you need to provide write access
   to amavis user to /var/lib/spamassassin, which is the default.  If the
   directory doesn't exist, it will be created by spamassassin but the
   permissions will correspond to the user invoking it.

6. Edit /etc/amavisd.conf.  Verbose version of config file is included to
   aid in configuration.