Lexmark MX321
Step 1
Make sure that the printer is connected to a network and that the network is connected to the Internet.
Can you send or receive faxes using etherFAX?
The problem is solved.
Go to step 2.
Step 2
From the control panel, navigate to:
Settings > > Fax > > Fax Setup > > General Fax Settings >
Make sure that you have the correct fax number.
Make sure that Fax Transport is set to etherFAX.
Go to step 3.
Step 3
Split large documents into smaller file sizes.
Go to https://www.etherfax.net/lexmark.
Are your fax messages not going through? Make sure that your printer is connected to a working analog telephone service.
Are you having issues transmitting your fax messages? Make sure that the document is loaded properly and enter the telephone number manually.