Download the A-List milter

Dependencies for the A-List milter

Sendmail >= 8.13	http://www.sendmail.org
DKIM milter	https://sourceforge.net/projects/dkim-milter
GnuTLS >= 2.0.4	http://www.gnu.org/software/gnutls
libgcrypt 1.4.0	http://gnupg.org/download/#libgcrypt

Unzip and Build the A-List
Also refer to the README, INSTALL and FEATURES files

tar -xvzf alist-milter-x.x.tgz
cd alist-milter-x.x
sh ./Build
sh ./Build install

Edit the /etc/services file
Add an entry for the A-List service

alist           6570/tcp                        # Message Level A-List

Start the A-List service
-t is the time in seconds for updating the A-List from Message Level
-h is the host to update from

alist-filter -p inet:8894@localhost -h alist.messagelevel.com -t 86400 &

Add a line to your sendmail.mc file
Make sure the DKIM filter funs before the A-List filter

INPUT_MAIL_FILTER(dkim-filter,S=inet:8891@localhost)dnl
INPUT_MAIL_FILTER(alist-filter,S=inet:8894@localhost)dnl				
                

Rebuild your sendmail.cf in the usual way

make -C /etc/mail

Testing the A-List milter
After sending a message to sendmail you should see a two headers added

X-MessageLevel-DomainInformation:
X-MessageLevel-DKIMDisposition: