[[https://my.spamexperts.com/kb/40/Using-outgoing-as-a-smarthost.html#heading_toc_j_9|cPanel Exim setup on SpamExperts]]



Add this in Exim conf in Section: POSTMAILCOUNT
<code>
smarthost_dkim:
  driver = manualroute
  domains = !+local_domains
  condition = ${if match_domain{$sender_address_domain}{lsearch;/etc/exim_spamexpert}}
  require_files = "+/var/cpanel/domain_keys/private/${sender_address_domain}"
  # 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 6623.smtp.antispamcloud.com::587

smarthost_regular:
  driver = manualroute
  domains = !+local_domains
  condition = ${if match_domain{$sender_address_domain}{lsearch;/etc/exim_spamexpert}}
  # 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 6623.smtp.antispamcloud.com::587
</code>

Add this in Exim conf in Section: TRANSPORTSTART
<code>
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 = $sender_address_domain
  dkim_selector = default
  dkim_private_key = "/var/cpanel/domain_keys/private/${dkim_domain}"
  dkim_canon = relaxed
  headers_add = X-AuthUser: ${if match {$authenticated_id}{.*@.*}\
 {$authenticated_id} {${if match {$authenticated_id}{.+}\
 {$authenticated_id@$primary_hostname}{$authenticated_id}}}}
  # Uncomment the line below in case you use a login for authentication
  #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 = X-AuthUser: ${if match {$authenticated_id}{.*@.*}\
  {$authenticated_id} {${if match {$authenticated_id}{.+}\
  {$authenticated_id@$primary_hostname}{$authenticated_id}}}}
 # Uncomment the line below in case you use a login for authentication
 #hosts_require_auth = *
</code>

In Exim Configuration Manager => Basic Editor => Access Lists --> "Only-Verify-Recipient" add 
<code>
6623.submission.antispamcloud.com
delivery.antispamcloud.com
</code>