To manage your mailboxes, you can choose between the following functions:
To create a new mailbox, click the button "New Mailbox".
To change a password, create an alias, rename or delete a mailbox,
click the respective actionslink right next to the mailbox.
There should be an addressee "postmaster" and "info" for every domain. In view of the spam problematic you should refrain from setting up a Catch-All-Forwarder.
You can access your mailboxes as follows:
Mailserver: mail.your-domain.de
Username: see column User Account
E-Mail-Adress: see Address