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End-of-Sale/Renewals for Models 100 and 200

As of October 4th, 2020, new sales for models 100 and 200 of the Barracuda Email Security Gateway ceased. As of November 30, 2023, renewals for models 100 and 200 of the Barracuda Email Security Gateway have ceased. 

How to Configure Google Workspace for Inbound and Outbound Mail

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This article addresses configuring Google Workspace Business and Education editions with the Barracuda Email Security Gateway as your inbound and/or outbound mail gateway.

Inbound Configuration

  1. Log into the Google Workspace admin console at
  2. From the Home page, go to Apps > Google Workspace > Gmail. From the Home page, go to Apps > Google Workspace > Gmail > Spam, Phishing, and Malware.


  3. Scroll to the Inbound gateway section and, on the right, click Enable, and then click Edit.
  4. In the Gateway IPs section, under IP Addresses / Ranges, enter the public IP addresses of the Barracuda Spam Email Security Gateway(s), specifying either a block of addresses or individual IP addresses.
  5. Select the following options:
    1. Automatically detect external IP (recommended)
    2. Reject all mail not from gateway IPs. MAKE SURE TO CHECK THIS BOX. All other mail will be rejected.

    3. Require TLS for connections from the email gateways listed above
  6. Click Save.
    More information on inbound gateways can be found here.

Figure 1: Google Workspace - Inbound Gateway Settings


Outbound Configuration

  1. Scroll to the Routing section, and locate Outbound gateway.
  2. Enter the IP address of the Barracuda Email Security Gateway that is the outbound mail gateway. 

Figure 2: Google Workspace - Outbound Gateway Settings


More information about outbound gateways can be found here.

Google Workspace IP Addresses can change, so please refer to this Google documentation.

Additional settings:

  • nslookup -q=TXT
  • server:
  • address:
  • Non-authoritative answer: text ="v=spf1 ip4:

ip4: ?all"

Configuring the Barracuda Email Security Gateway

  1. Navigate to DOMAINS > Domain Manager and specify your domain in New Domain Name, then click Add Domain.
  2. Click the Manage Domain link and then BASIC > IP Configuration. Add the Google Workspace destination mail servers as follows:













Also add the Destination Server name/IP address or hostname that receives email after spam and virus scans. It is usually best to use a hostname rather than an IP address so that the destination mail server can be moved and DNS updated at any time without having to make changes to the Barracuda Email Security Gateway configuration.

If you set Use MX Records (on the same page) to Yes, you must enter a domain name for this field. If multiple servers are specified, then the delimiter used determines the behavior (see below). Note that you can either configure Use MX Records for all domains from the BASIC > IP Configuration page, or you can configure it per-domain from DOMAINS > Domain Manager > Manage Domains, then using the BASIC > IP Configuration page for the domain you choose to manage. It is NOT recommended to set Use MX Records to Yes to avoid a potential mail loop.

  1. Comma (",") or semi-colon (";") - Each entry in the list will used in round-robin fashion, with relative weights determined by the number of times a particular entry is listed.
  2. Space (" ") - Each entry in the list will be treated as a failover list, with an entry being used only if all entries preceding it in the list are unreachable.

For more information about what it means to use MX records, please see Using MX Records.

How to Configure Google Workspace to Bypass the Barracuda Email Security Gateway for Internal Mail 

In the Google Workspace Admin console:

  1. Go to Apps > Google Workspace > Gmail > Advanced Settings.
  2. On the General Settings tab, scroll down to the Routing section. This is where you set your Outbound Gateway to route mail to the Barracuda Email Security Gateway. To the right, click EDIT, and add a route as shown.
  3. Select Internal - sending.
  4. Under Show Options, Envelope filter, select Only affect specific envelope recipients .
  5. Under Pattern match, enter a REGEX expression containing your domain. For example,  for , you could use  .*@mywork\.com


  6. Scroll down in the popup and, under Route, select Change route.


  7. Scroll down and click Show Options.


  8. Under Account Types to affect, select Users and Groups. Click SAVE.


Now all internal mail is routed directly to Google servers, and all other mail routes through Outbound Gateway.