Set the mail server from Web Config.
Check below before setting up.
The printer is connected to the network that can access the mail server.
Email setting information of the computer that uses the same mail server as the printer.
When you use the mail server on the Internet, confirm the setting information from the provider or website.
You can also set the mail server from the control panel. Access as below.
Settings > General Settings > Network Settings > Advanced > Email Server > Server Settings
Access Web Config and select the Network tab > Email Server > Basic.
Enter a value for each item.
Select OK.
The settings you have selected are displayed.
When the setup completes, perform the connection check.