Configuring Split Domain Routing (SDR)

SmarterMail > Server Configuration and Management
Configuring Split Domain Routing involves configuring DNS records and email forwarding rules to manage how emails are delivered to different servers.

To set this up in SmarterMail, what you will need to do is to go to the domain settings for that domain and adjust the inbound delivery setting. 
  1. Go to Manage > Domains > {DOMAIN} > Options. 
  2. Here you will see a card labeled email. 
    1. https://help.smartertools.com/SmarterMail/Current/Topics/SystemAdmin/Manage/DomainDefaults#email
    2. Inbound Message Delivery- Administrators can specify the domain location for incoming email delivery. This allows you to specify whether the domain is hosted locally or partially/entirely on an external server. The following options are available:
      • Local - Select this option if the mail server is hosted locally.
      • External (use MX record) - Select this option if the mail server is hosted partially or entirely externally. Messages will be delivered based on an MX lookup. Select the option "Deliver locally if user exists" to perform a local delivery instead of external if the user exists locally.
      • External (use host address) - Select this option if the mail server is hosted partially or entirely externally. Messages will be delivered to the specified host address. The host address can either be entered as an IP address or the Fully Qualified Domain Name (FQDN), such as mail.yourdomain.com. Select the option "Deliver locally if user exists" to perform a local delivery instead of external if the user exists locally.
  3. Adjust the Inbound Message Delivery to be External and fill in the details of the server or use the MX if it is pointing at the other server. 
  4. Make sure to enable Deliver locally if user exists so that it does not skip any local users. 
Things to note. If you have "Require SMTP Authentication" enabled in the Security [card] you will want to add a "Bypass SMTP Authentication" for the domain name. This can be done by adding a whitelist entry under: Settings > Security > Whitelist, with the following 
  • Source = Domain Name
  • Domain Name = {DOMAIN}
  • Description = {optional}
  • Security 
    • Bypass SMTP Authentication = Enabled
Article ID: 3735, , Modified: Today at 9:12 AM

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