cPanel/WHM Username-based Authentication

1. Log in to Spam Experts, ensure the User is added as an authenticating method by following the Add an Outgoing User > Authenticating User instructions
   1. When adding the Authenticating User, ensure the correct limits are set matching your traffic volumes
2. Open WHM and navigate to the Exim Configuration Editor
3. Select Advanced Editor
4. Add the following to the POSTMAILCOUNT section:

smarthost_dkim:
  driver = manualroute
  domains = !+local_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
  # 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

5. 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}}"
  hosts_require_auth = *

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}}"
  hosts_require_auth = * 

6. Add the following to the AUTH section:

Spam Experts_login:
  driver = plaintext
  public_name = LOGIN
  client_send = : username@demo-domain.invalid : yourUserPassword

Replace username@demo-domain.invalid with your username, and YourUserPassword with your password

Please ensure any special characters in the password required are escaped.

7. Save and restart
8. Make sure that you Allow list all your Spam Experts IPs, or add the Spam Experts hostname (spf.antispamcloud.com) to the following location:

Exim Configuration Manager > Basic Editor > Access Lists > "Only-Verify-Recipient".

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