Lexmark CX860
From the control panel
From the control panel, touch Settings > Fax > Fax Server Setup > Fax Server E‑mail Settings.
Configure the settings.
Note: To use the SMTP server setting for e‑mail, enable Use E‑mail SMTP Server.
From the Embedded Web Server
Open a web browser, and then type the printer IP address in the address field.
Notes:
Click Settings > Fax > Fax Server Setup.
From the Fax Server E‑mail Settings section, configure the settings.
Click Save.