Suddenly my Kyocera m3040idn will not send scanned emails from my comcast email acct

I have been using my kyocera m3040idn to scan and email without any issues. Suddenly I am getting errors. The settings are as required: my email address, password , smtp.comcast.net , 587 ,smarttls.

I have no problem sending emails from my pc using the same setting.

Please help.

Thanks,

Joe