If you wish to enable Catch All feature for a domain, then you can do via the below mentioned steps:

[1] Login to your Smarter Mail administrator account. Once you login search the domain for which you wish to enable Catch All feature:


[2] Now right click on domain name, click on 'Edit' then click on 'feature' tab from here you have to tick mark the check box infront of Catch-All Alias and click on Save button.