...
After logging in email user interface for list owner email, click the “Mailing Lists” menu in the left-hand menu.
Click on the listed mailing list.
Select “Manage Moderators” from the Left-hand menu. From here you can view moderator email address, add additional moderators or remove moderators for the mailing list.
Sending mass email
Send the email to the mailing list email address [name_mailing_list@domain.com] from the list owner/moderator [postmaster@domain.com] email address.
If the ‘message require approval option’ is enabled (by default it is enabled), the mailing list will send a confirmation email to owner/moderator email address(es)
The mass email is sent to subscriber email addresses after approval from owner/moderator.
Mailing List Manager Help
...