MspPortal Mail Secure:What is a Sibling Domain (Commonly known as alias domain)

What is a Sibling Domain (Commonly known as alias domain)

A sibling domain is an exact replica of a primary domain, in all respects except the name of the domain itself. The primary domain and the sibling domain must have the exact same mail host, email account lists, aliases, spam filtering settings, and so forth. For example, may be a primary domain while may be a sibling domain — in which case, when the filter receives any message to an address at, it will treat the message exactly as if the message was sent to the same an address at The sibling domain can be added in the Domains section of the control panel.

Under Domain Overview
Use the same MX records as you primary domain just substitute the primary domain for the sibling

Primary Domain
MX 10
MX 90

Alias Domain
MX 10
MX 90

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