We're going to build and install Sendmail so that it processes all inbound, outbound, and relayed mail looking for viruses and SPAM. We use a *very* similar setup on the linux-sxs.org site.

1. install perl
2. Use Perl's builtin CPAN module to add some additional Perl modules:
• perl -MCPAN -e shell
• you can get away with picking the defaults to configure CPAN (if prompted to configure it)
• install MD5
• install LWP
• (you may need to use 'force install LWP')
• install File::Path
• install File::Spec
• install IPC::Open2
• install E/ER/ERYQ/IO-stringy-2.108.tar.gz
• install MIME::Base64
• install MIME::QuotedPrint
• install Net::SMTP
• install Mail::Internet
• install Digest::SHA1
• install Net::DNS
• install Digest::Nilsimsa
• install HTML::Parser
• install Mail::Audit
3. install ClamAV (or some other anti-virus program)
4. install Vipul's Razor
5. install MIME-Tools
6. install SpamAssassin
7. install db
8. install Sendmail per these instruction. Follow steps 1-8, but stop right before doing the sh Build config.cf
9. add to the end of the config.mc file:
   • INPUT_MAIL_FILTER(`mimedefang', `S=unix:/var/spool/MIMEDefang/mimedefang.sock, F=T, T=S:60s;R:60s;E:5m')dnl
10. continue installing sendmail per the instruction here starting with sh Build config.cf
11. create the spool dir for MIMEDefang
• mkdir /var/spool/MIMEDefang
12. correct the ownership of the spool dir
• chown smmsp:smmsp /var/spool/MIMEDefang
13. correct the permissions on the spool dir
• chmod 700 /var/spool/MIMEDefang
14. install MIMEDefang