For OS 9 or less, users will need to configure their TCP/IP and their Remote Access control panels as depicted in the JPEGs.
 

Under the File menu select Configurations. Create a new configuration named
EmsaNet. Then configure as in the JPEGs with the appropriate telephone
access number, username and password in the Remote Access control panel.
Configure the TCP/IP control panel to "Connect via PPP" and "Configure:
Using PPP Server".

 

For OS X, users will need to select their Network panel of their System
Preferences. Select the Location popup menu and choose "New Location." Name it "EmsaNet". Select the "Internal Modem" option from the "Show:" popup menu. Configure the TCP/IP tab to "Configure: Using PPP". Then select the "PPP" tab and fill in the "Service Provider:" as "EmsaNet". Enter the appropriate telephone access number. Enter your username (user@emsanet.com) in the "Account Name" box. Enter your password. PPP Options can be left as the default options. Proxies and Modem tabs may be left to the default values.

You will need to configure your email client with the appropriate account information.

Account ID or Username and password.
Mail server: mail.emsanet.com
SMTP server: mail.emsanet.com
 

Please Note Password and Username are Case Sensitive