Canon MF8580Cdw User Manual page 569

Printing from USB Memory (USB Print)
＃839
A user name and password that are used for SMTP authentication are not set correctly.
Set the user name and password correctly.
Configuring Basic E-mail Settings
Configuring Advanced E-mail Settings
＃841
When sending an e-mail, an encryption algorithm that is common to the mail server is not present.
Clear the [Use SSL] check box for both SMTP and POP servers.
Configuring Advanced E-mail Settings
Add the common encryption algorithm to the mail server settings.
＃844
SSL encrypted communication to a POP server failed when sending an e-mail with POP before SMTP.
Check the SSL encrypted communication settings in the POP server.
Clear the [Use SSL] check box for the POP server. If the problem persists, clear the [Use POP before SMTP] check box,
and set the communication setting to a setting other than POP before SMTP.
Configuring Advanced E-mail Settings
When verifying an SSL server certificate to communicate to the POP server, a verification error occurred.
Check that the CA certificate that signed the SSL server certificate on the POP server side is registered to the machine
by using the Remote UI.
Verifying Key Pairs and Digital Certificates
Check that the SSL server certificate on the POP server side is valid.
Check that the SSL server certificate is not a self-signed certificate.
＃846
An e-mail could not be sent due to a POP authentication failure.
Check the setting, and try again.
Configuring Advanced E-mail Settings
＃852
The machine turns OFF for some reason.
Check whether the power plug is inserted into an outlet firmly.