Lexmark CX725
From the control panel
From the control panel, touch Settings > E‑mail > E‑mail Setup.
Configure the settings.
From the Embedded Web Server
Open a web browser, and then type the printer IP address in the address field.
Notes:
Click Settings > E‑mail.
From the E‑mail Setup section, configure the settings.
Click Save.
Configure the SMTP server to use the fax function of your printer.
Here are steps on how to set up Gmail SMTP server for Lexmark 2016 up to the latest devices.