When you click on the Multi-Recipient Address (MRA) icon in HELM you will be shown a list of MRAs for that particular domain.
The options on this screen are defined as follows:
Email Address - This is the email address for the MRA.
Email Server - This is the DNS name of the mail server.
Email Server IP - This is the IP address of the mail server.
Recipient Addresses - This is the list of addresses the MRA will send email to.
Set as the Catch all Account - This sets the MRA to receive all email from all email addresses on the domain that do not exist.