Based on the version of Smartermail web mail being used, simply typing the mail server address will load the login securely, i.e. mailx7.newtekwebhosting.com.
For clients using the Plesk email service, in order to load the login page securely you would need to use the following:
https://pscvmplsk101.newtekwebhosting.com:9999/Login.aspx
Just substitute the first part, pscvmplsk101, with the Plesk server your site is on, i.e. cloudplesk2, so https://cloudplesk2.newtekwebhosting.com:9999/Login.aspx.
