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How to configure Outbound SMTP Authentication?

03/26/2020 1,076 People found this article helpful 201,715 Views

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    Description

    Article Applies To:

    SonicWall Email Security Appliances: 3300, 4300, 8300, 5000, 7000, 9000, ES VA.
    Firmware/Software Version: 9.1.3 and above

     

    The new SMTP authentication support for Email Security 9.1.3 and above can be used to protect the customer’s infrastructure from unauthorized use. For example, requiring a user to authenticate before sending outbound email can prevent an open relay.

    Resolution

    To configure SMTP Authentication for Outbound, follow these steps:

    • Navigate to Manage > Network > Server Configuration page.
    • Under Outbound Email Flow, click on Add Path, if you have a path already configured then click on the path and edit the path
    • Scroll down to the Advanced Settings section
    • Under Use this text instead of a host name in the SMTP banner, enter a hostname. This is optional
    • Under Reserve the following port, enter a port number or keep the default port number
    • Enable the check box under Enable StartTLS on this path.
    • Click on Configure Authentication

     

    Image

     

    • On the next page, select the radio button under This path uses credential as follows.
    • Enable the check box Sends an SMTP AUTH command with the following credentials to the downstream mail server.
    • Under Require encrypted connectsion for authentication (SMTP AUTH) commands, enable the check boxes under Upstream Connections and Downstream connections.
    • Click on Apply to save the changes.

    Image

    NOTE: Authentication does not protect the contents of the email. Therefore, TLS must be enabled as well so that the credentials passed on to the authenticating host are leveraging TLS encryption. This ensures that the SMTP Auth credentials are not passed over in the clear.

     

    Related Articles

    • Network Security Essentials eLearning Training Course
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    • How to add inbound path in Hosted Email Security

    Categories

    • Email Security > Email Security Appliance
    • Email Security > Email Security Software
    • Email Security > Email Security Virtual

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