The Helm 4 Mail Aliases icon is used to add or modify email aliases for your domain.
To add a new mail alias to your domain, start by clicking mail aliases icon. You will then be shown a list of the current mail aliases.
Click on the add button to add a new mail aliases, and then input the alias name and then the list of email addresses you would like it to send to.
Once you save the settings you will be returned to the email aliases list.