Besides a mailbox you can add as many aliases you like to the domains you own. This is the connection between the domain and the Soverin mailbox.
Note: If you're using a @soverin.tld email address for your mailbox, you can't add email aliases.
Use the following steps to add an additional alias:
Login to your Soverin Dashboard at my.soverin.net.
Click on Domains and select your domain name.
Click on Aliases and Add new alias.
Fill in the name before the @ sign and the mailbox where the mail must be placed. Then click Save.