This method applies to SmarterMail 8.x - 12.x:

To enable catch-alls for a domain in SmarterMail, follow these directions:

Log in to SmarterMail as the system administrator.

Click the Domains icon.

Select the desired domain in the navigation pane.

Click Edit in the content pane toolbar. The domain settings will load in a popup window.

Click the Features tab.

Select the Catch-All Alias checkbox.

Click Save.

Next you will need to create a catch-all alias for the domain and assign it to a specific mailbox. To do so, follow these steps:

Log in to SmarterMail as the domain administrator.

Click the Settings icon.

Expand the Domain Settings folder in the navigation pane.

Click Aliases.

Click Set Catch-all in the content pane toolbar.

Select the alias you would like to use as the catch-all.

Click Save.

NOTE: It is important to never set an auto-responder on an email account that the catch-all forwards to, as it may result in backscatter. This can cause your domain to be blacklisted. In addition, additional bandwidth usage will result. If you do not see the option for adding a catch-all, please contact your system administrator as they may have disabled the option.