Advanced
In case your Sophos UTM cannot send emails directly, you can configure a smarthost to send the emails. Proceed as follows:
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Enable External SMTP server status on the Management > Notifications > Advanced tab.
Click the toggle switch.
The toggle switch turns amber and the External SMTP Server area becomes editable.
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Enter your smarthost.
You can use drag-and-drop. The port is preset to the default SMTP port 25.
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Specify the authentication settings.
If the smarthost requires authentication, check the Authentication checkbox and enter the corresponding username and password.
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Click Apply.
Your settings will be saved.
The toggle switch turns green.