Reset email account password by Admin 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 reset email account password from Smartermail
2) Go to the last button of the top panel > Domain Settings
3) Select the Accounts on Left panel
4) Click on the email account from email account list then click on … button and Change Password
5) Change the password and save it.