Customers Using the Following Instances of the Barracuda Email Security Service Instance
Network Traffic to ESS (SMTP) | Network Traffic from ESS (SMTP and other) | |
---|---|---|
Australia (AU) | 3.24.133.128/25 | 3.24.133.128/25 |
Canada (CA) | 15.222.16.128/25 | 15.222.16.128/25 |
Germany (DE) | 35.157.190.224/27 18.185.115.192/26 18.184.203.224/27 | 35.157.190.224/27 |
United Kingdom (UK) | 35.176.92.96/27 18.133.136.128/26 18.133.136.96/27 | 35.176.92.96/27 |
United States (US) | 64.235.144.0/20 209.222.80.0/21 | 64.235.144.0/20 209.222.80.0/21 |
Ensure Connectivity and Redundancy
Follow these tips to ensure connectivity and redundancy:
- Open your firewall ports to allow the IP address ranges, based on your Barracuda Email Security Service instance.
- (Optional) Configure your mail server or router to block inbound email not originating from your Barracuda Email Security Service IP address ranges.
- If you have a Barracuda Web Security Gateway or Barracuda Web Application Firewall: You might need to exempt ess.barracudanetworks.com from filtering.
- Exempt traffic coming from the Barracuda Email Security IP addresses from any kind of throttle or rate controls, RBL, and SPF or DKIM scanning.