Setup remote spam filtering on in Exim

We fight with this every time, so this is as much being shared as is place for us to reference this in the future. These instructions will guide you through the configuration of a server to support remote spam filtering for selective clients. These instructions assume root access to the server, and the use of Exim mail handler. In our shared hosting environments we use the following to setup SpamTitan, however this should work for any similar configuration requirement. ---------------------------------------------------------------------------------------------------------------------------------------- Step 1: Setup Remote Handler ---------------------------------------------------------------------------------------------------------------------------------------- Setup Spamtitan Add domain under Settings > Relay Settings (one for each domain) Add user login under Anti-Spam Engine > Admins (one for each domain - Domain Administrator - Full Access) DNS Setup MX Records for DNS Remove Old MX domain.com. - 14400 - IN - MX - 0 - domain.com. Add New MX domain.com. - 14400 - IN - MX - 0 - cloud1.spamtitan.com. domain.com. - 14400 - IN - MX - 10 - cloud2.spamtitan.com. Set Email Routing option to "Local Mail Exchanger" Testing the server is forwarding (before Step 2) Send email from Gmail to Server - once received should have spam titan in header Testing that Server is Blocking direct email (after Step 2) wormly.com/test_smtp_server cloud1.spamtitan.com (should work) mail.yourserver.com (should block) ---------------------------------------------------------------------------------------------------------------------------------------- Step 2: For Single Domain on Server using SpamTitan (Option A) ---------------------------------------------------------------------------------------------------------------------------------------- sant-media.co.uk/2010/03/how-to-configure-exim-to-receive-email-for-domain-only-from-specific-ip-addresses/ Adding new client to existing setup Add new client domain to the domainlist file /etc/exim/spamtitan_domainlist Restart Exim Done! Creating SpamTitan Exim Setup for the First Time Create Client Rule Files /etc/exim/spamtitan_domainlist account-website.com /etc/exim/spamtitan_hostlist localhost *.yourserver.com *.spamtitan.com Add Rules in Exim Advanced Editor Add Setting - domainlist domainlist spamtitan_domainlist lsearch;/etc/exim/spamtitan_domainlist Add Setting - hostlist hostlist spamtitan_hostlist = /etc/exim/spamtitan_hostlist : /etc/localdomains : net-iplsearch;/etc/relayhosts Add Code in Section: custom_end_recipient deny !authenticated = * !hosts = +spamtitan_hostlist domains = +spamtitan_domainlist log_message = "SpamTitan Relay Block from $sender_fullhost" message = "Please use the proper domain MX record"