The Relay SMTP Servers sending mode implies that the sending is performed via one or several SMTP servers.
Open "Settings" dialog, select "Sending" tab. Select the "Relay SMTP servers" radio button.
Before sending using the Relay SMTP Servers, you should configure at least one smtp server.
Select "SMTP Servers" tab:
Click "Add" button to add new SMTP server settings.
Then follow SMTP Server Configuration instruction.
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