Adding a user into Smartermail:
You must be logged in as a Domain Administrator or System Administrator.
Log in to SmarterMail
Go to Settings
Select Domains
Click the domain you want to add the user to
Choose Users
Click New (or Add User)
Username (email address prefix)
Password
Display Name
Mailbox Size (or leave unlimited if allowed)
Optional:
Enable/disable Webmail, IMAP, POP, SMTP
Assign User Role (Standard user, Domain admin, etc.)