Create email account in SmarterMail v16
1) Login to the web interface as administrator through URL : mail.yourdomainname.com with administrator username with password
Note: The email account need to have administrator privilege in order to create email account from smartermail
2) Go to the last button of the top panel > Domain Settings
3) Select the Accounts on Left panel
4) The message box will prompt out, please insert the detail inside. Once done, Save it.
5) It will redirect to account summnary page, save it again. The email account is created.
Please refer to the following article to know more.
Knowledge Base: Unable to access to Smartermail login page