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Lexmark CX431

Lexmark CX431

Setting up the fax function using fax server


  • This feature lets you send fax messages to a fax service provider that supports e‑mail receiving.
  • This feature supports outgoing fax messages only. To support fax receive, make sure that you have a device‑based fax, such as analog fax, etherFAX, or Fax over IP (FoIP), configured in your printer.
  1. Open a web browser, and then type the printer IP address in the address field.


    • View the printer IP address on the home screen. The IP address appears as four sets of numbers separated by periods, such as
    • If you are using a proxy server, then temporarily disable it to load the web page correctly.
  2. Click Settings > Fax.

  3. From the Fax Mode menu, select Fax Server, and then click Save.

  4. Click Fax Server Setup.

  5. In the To Format field, type [#], where [#] is the fax number and is the fax provider domain.


    • If necessary, configure the Reply Address, Subject, or Message fields.
    • To let the printer receive fax messages, enable the device‑based fax receive setting. Make sure that you have a device‑based fax configured.
  6. Click Save.

  7. Click Fax Server E‑mail Settings, and then do either of the following:

    • Enable Use E‑mail SMTP Server.
    • Note:  If the E‑mail SMTP settings are not configured, then see Configuring the email SMTP settings.

    • Configure the SMTP settings. For more information, contact your e‑mail service provider.
  8. Apply the changes.

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