cPanel/WHM IP-based Authentication (selected domains)

This method allows you to filter selected domains via our Outgoing filter, while using IP authentication. Any domains not configured will continue to use the standard cPanel router and transport for outbound mail.

1. Log in to Spam Experts, ensure the IP address is added as an authenticating method by following the Add an Outgoing User > Authenticating IP or Range instructions
   1. When adding the Authenticating IP, ensure the correct limits are set matching your traffic volumes
2. SSH to the cPanel/WHM node
3. Create a text file /etc/spamexperts_domains
4. Add the domain(s) that you wish to filter outbound mail for in this new file, one domain per line
5. Save the file
6. Open WHM and navigate to the Exim Configuration Editor
7. Select Advanced Editor
8. Add the following to the POSTMAILCOUNT section:

smarthost_dkim:
  driver = manualroute
  domains = !+local_domains
  condition = ${if match_domain{$sender_address_domain}{lsearch;/etc/spamexperts_domains}}
  require_files = "+/var/cpanel/domain_keys/private/${lookup{$sender_address_domain}dsearch{/var/cpanel/domain_keys/private/}}"
  # Exclude null sender messages from relaying via the smarthost
  condition = ${if or {{!eq{$sender_address}{}} {!eq{$sender_host_address}{}}}}
  transport = remote_smtp_smart_dkim
  route_list = $domain SMARTHOST::587
 
smarthost_regular:
  driver = manualroute
  domains = !+local_domains
  condition = ${if match_domain{$sender_address_domain}{lsearch;/etc/spamexperts_domains}}
  # Exclude null sender messages from relaying via the smarthost
  condition = ${if or {{!eq{$sender_address}{}} {!eq{$sender_host_address}{}}}}
  transport = remote_smtp_smart_regular
  route_list = $domain SMARTHOST::587 

Replace SMARTHOST with the your SMTP hostname

9. Add the following to the TRANSPORTSTART section

remote_smtp_smart_dkim:
  driver = smtp
  hosts_require_tls = *
  interface = ${if exists {/etc/mailips}{${lookup{$sender_address_domain}lsearch*{/etc/mailips}{$value}{}}}{}}
  helo_data = ${if exists {/etc/mailhelo}{${lookup{$sender_address_domain}lsearch*{/etc/mailhelo}{$value}{$primary_hostname}}}{$primary_hostname}}
  dkim_domain = $sender_address_domain
  dkim_selector = default
  dkim_private_key = "/var/cpanel/domain_keys/private/${lookup{$dkim_domain}dsearch{/var/cpanel/domain_keys/private/}}"
  dkim_canon = relaxed
  headers_add = "${perl{check_mail_permissions_headers}}"
 
remote_smtp_smart_regular:
  driver = smtp
  hosts_require_tls = *
  interface = ${if exists {/etc/mailips}{${lookup{$sender_address_domain}lsearch*{/etc/mailips}{$value}{}}}{}}
  helo_data = ${if exists {/etc/mailhelo}{${lookup{$sender_address_domain}lsearch*{/etc/mailhelo}{$value}{$primary_hostname}}}{$primary_hostname}}
  headers_add = "${perl{check_mail_permissions_headers}}" 

10. Save and restart

All traffic from the cPanel/WHM server will be routed to the Spam Experts filtering nodes.