Alias domains automatically inherit the email configuration of their primary domain so that emails addressed to a recipient at the alias domain are delivered to the same recipient in the primary domain.
The advantage of alias domains is that they require no ongoing configuration once set-up – everything works automatically.
You should read the following notes carefully before deciding whether alias domains are appropriate for you:
- Alias domains are not configurable. You can’t, for instance, alter their spam configuration or change the destination delivery – they simply inherit the settings of the primary domain.
- Emails addressed to alias domain are delivered to the primary domain – e.g. if test.co.uk is the primary, and test.com is the alias, then emails addressed to firstname.lastname@example.org will be delivered to the destination server as email@example.com. This can cause issues if the customer server is performing routing based on the domain used.
- You can’t have differences between the domains – e.g. you can’t have firstname.lastname@example.org delivered differently to email@example.com.