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As of March 1, 2022, the legacy Barracuda Essentials Security, Compliance, and Complete editions are no longer available for purchase. Only existing customers can renew or add users to these plans. The documentation and trainings related to these plans will no longer be available after October 30, 2022. For more information on the latest Email Protection plans, see Barracuda Email Protection.

To update your bookmarks, see the following for the latest documentation and trainings:

Note that MSP customers should continue to follow Barracuda Essentials for MSPs.

Step 2 - Configure G Suite for Inbound and Outbound Mail

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To deploy Barracuda Essentials with G Suite, you must have a G Suite Basic, Business, or Enterprise account. The legacy free edition of G Suite is missing key features required for this deployment. For details on upgrading your G Suite subscription, refer to the Google Support article G Suite legacy free edition.

Google IP addresses and user interfaces can change; refer to the G Suite Administrator Help Center for updates and configuration details.

You can specify the Barracuda Email Security Service as an inbound mail gateway through which all incoming mail for your domain is filtered before reaching your Google account. The Barracuda Email Security Service filters out spam and viruses, then passes the mail on to the Google mail servers. Use the Configure Inbound Mail Flow instructions below to configure.

You can also specify the Barracuda Email Security Service as the outbound mail gateway through which all mail is sent from your domain via your Google account to the recipient. As the outbound gateway, the Barracuda Email Security Service processes the mail by filtering out spam and viruses before final delivery. By configuring Google as described in Configure Outbound Mail Flow below, you instruct the Google mail servers to pass all outgoing mail from your domain to the Barracuda Email Security Service (the gateway server).

Step 1. Launch the Barracuda Email Security Service Setup Wizard

  1. Log into your Barracuda Cloud Control account. On the left side, select Email Security
    The Email Security wizard launches. Click Next.
  2. Select the Region for your Data Center. Then click Get Started.

    After you select your Region, you cannot change it.



  3. Enter the primary email domain you want to protect with Barracuda Email Security Service. Then click Next
  4. The system automatically retrieves your current MX records and auto-fills that information as your Destination Server. If this is not the correct Destination Server, click Remove and add the Destination Server with the correct data. 
    If you want to add additional servers, enter data for those servers now.
    After you properly configure the Destination Server, enter a valid User Name to test the mail server connection. 
    After you have determined that the settings are correct, click Next
  5. Select your settings, accepting the default values or making changes if needed, then click Next.

  6. Barracuda Networks recommends verifying your domain via MX records with Priority 99. If you do not want to update MX records now, check the box and select a different method. 
    In the first case, click Verify MX Records. Otherwise, click Confirm Validation.

    Note that after verifying your domain, any mail sent to your domain from another Barracuda ESS customer will be processed normally by your ESS account and not delivered via MX records.

  7. When the verification is successful, click Next.

    If the verification is not successful, a message appears, letting you know that the domain could not be verified. 
    If you are having DNS issues that you want to address, click Skip   to exit the wizard. Behind the wizard, click the  Domains tab to retry the validation. 
  8. Click Finish to finalize the setup and close the wizard.

Step 2. Add Additional Email Domains (Optional)

You configured your primary email domain in Step 3 of the wizard, above.

Use the steps in the following section if you want to protect additional domains with Barracuda Email Security Service. If you are only protecting one domain, continue below with Step 3. Configure Inbound Mail Flow

  1. Log into the Barracuda Cloud Control as administrator. In the left panel, click Email Security. Select the Domains tab, then click Add Domain.
  2. Enter the domain name and the Primary MX record for Google: (see Table 1 below).
  3. Click Add Domain; the Domain Settings page displays, listing the new domain.
  4. Click Add Mail Server and add the remaining four mail servers from Table 1 below.

  5. Click Save Changes and then click the Domains tab at the top.
  6. Click Verify Ownership and select one of the 3 methods to verify your domain.

  7. Repeat these steps, as needed, for additional domains before continuing with Step 3 below.
  8. After the mail server is verified, the Verified verifyIcon.png icon displays in the Status column and a confirmation message displays at the top of the page.

Table 1. G Suite Destination Mail Servers

PriorityG Suite Destination Mail Server

Step 3. Configure Inbound Mail Flow

Before completing the steps in this section, verify your MX records display in the Barracuda Email Security Service MX records; otherwise mail delivery issues may be introduced.

  1. Log into the G Suite admin console at
  2. From the Home page, go to Apps > Google Workspace > Gmail.
  3. Select Spam, Phishing and Malware from the list.
  4. Click Inbound gateway, and select the Enable check box.

    Note: If you have an inbound gateway configured, you need to add only the Barracuda IP ranges.

  5. Click Add under Gateway IPs.
  6. Enter the IP address/range for your Barracuda region.
    For example, if you are in the US region, type, click Save. Click Add and then type Click Save again.
    For other regions, refer to the IP addresses listed in Barracuda Email Security Service IP Ranges.
  7. Select the following options:
    1. Automatically detect external IP (recommended)
    2. Require TLS for connections from the email gateways listed above

      Note: if you are routing internal mail through Barracuda (default), you must also select Reject all mail not from gateway IPs.


  8. Click Save.

Step 4. Internal Mail

By default, your internal mail is sent out to your inbound MX record, which points to the Barracuda Email Security Service. This is by design for Google mail systems. To ensure that your internal mail stays internal, you must create a routing rule.

To configure a routing rule, follow the instructions below:

Step 1. Create Local Host
  1. Log into the G Suite admin console at
  2. From the Home page, go to Apps > Google Workspace > Gmail.
  3. Click Hosts.
  4. Click Add Route. Enter a route name. For example, "Internal Mail".
  5. Select Multiple hosts.
  6. Enter the following Primary host details, and then click Add Primary.
    1. Hostname –
    2. Port – 25
    3. Load– 100%
  7. Enter the following Secondary host details, and then click Add Secondary.
    1. Hostname –
    2. Port – 25
    3. Load– 100%
  8. Under Options, select Require secure transport(TLS) and Require CA signed certificate.
  9. Click Save.
Step 2. Create Routing Rule
  1. Navigate to Apps > Google Workspace > Gmail.
  2. Click Routing at the bottom of the page.
  3. Under the Routing section, click Configure.
  4. Enter a name for the rule. For example, "Internal Mail".
  5. Under Email messages to affect, select Internal - Sending.
  6. Under For the above types of messages, do the following, click the Down arrow and then select Modify message.
    1. Select Change route.
    2. From the list of options, select the host you created above in Step 1. Create a Local Host.
  7. Toward the bottom, click Show options. Under Account types to affect, select Users and Groups.
  8. Click Save.

    The new rule displays in the Routing section.    

Step 5. Configure Sender Policy Framework for Outbound Mail

To ensure Barracuda Networks is the authorized sending mail service of outbound mail from your Barracuda Email Security Service, add the Sender Policy Framework (SPF) record INCLUDE line of the SPF record for your sending mail server for each domain sending outbound mail. See  Sender Policy Framework for Outbound Mail  for INCLUDE entries based on your Barracuda Email Security Service instance.

For example, your record will look similar to: v=spf1 -all

  • If you have an SPF record set up for your domain, edit the existing record, and add the following to the INCLUDE line for each domain sending outbound mail based on your Barracuda Email Security Service instance. For example: -all
  • If you do not have an SPF record set up for your domain, use the following value to create a TXT record that creates a HARD Fail SPF for your domain based on your Barracuda Email Security Service instance. For example: v=spf1 -all

For more information, see Sender Authentication.

Step 6. Configure Outbound Mail Flow (Optional)

To ensure outbound mail delivery, contact Barracuda Networks Technical Support to have Hosted Outbound Relay  enabled on your account. Failure to do so will result in undeliverable messages.

The steps in this section are taken from G Suite Admin Help.

  1. Navigate to Apps > Google Workspace > Gmail.

  2. Click Routing toward the bottom of the page.

  3. Click Outbound gateway.

  4. Enter the Outbound smart hostname provided to you in the settings for your domain within the Barracuda Email Security Service interface:


  5. Click Save in the bottom right corner.

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