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Add a Domain Alias

Our domain aliasing feature enables inbound filtering customers to create domains which are aliases for their primary(canonical) domain(s). All messages sent to an alias domain are treated exactly as if they were sent to the associated primary(canonical) domain.
  • Domain aliases do not cost extra and do not count against your number of filtered inbound domains. A domain can have any number of aliases.
  • Messages to alias domains are sent to the same downstream address as if they were sent to the canonical domain.
  • Logins can only be created using primary(canonical) domains. If an existing login becomes associated with an alias domain (i.e. the domain is de-provisioned, and then added again as an alias), it will not/no longer authenticate in the domain console.
  • Domain Aliasing introduces the concept of alias recipients. An alias recipient is a recipient where the username is the same, but the domain is an alias. is an alias for is a valid alias recipient for
  • A quarantine digest(where applicable) will include messages to a given recipient, as well as any alias recipients.

Domain Aliasing with the Inbound API

  • The inbound API adds endpoints to create and delete domain aliases.
  • The inbound API endpoints that return information about domains will include a list of any aliases.
  • Any attempts to manipulate alias domains as if they are canonical domains, e.g. adding blocklist items, will result in an error.


  1. On a computer, sign in to Host Console.
  2. From the Dashboard, click Inbound.
  3. Click Domains.
  4. You must add the primary domain to your console before an alias can be assigned. Locate the domain you wish to alias or go back to the "Add a domain" section of this guide and protect your primary domain before proceeding.
  5. Click the Settings (gear) icon for the primary domain and select "Domain Alias Settings" from the list. The dialog popup will display all existing aliases found, and allows modification or removal of existing aliases for this domain.
  6. Enter the full alias domain name you wish to use in the provided text box and click "Add" to assign this alias to the primary domain. Note that this new alias appears in the list of domains as well as under the "Domain Alias Settings" dialog popup associated with the primary domain, where any changes can be made to the alias if necessary.



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