
Proofpoint Email Security and Protection
Barracuda Email Security Gateway
Symantec Email Security.cloud
Cisco Email Security
Area 1 Security
Barracuda Email Protection
FortiMail
The UniFi® Security Gateway extends the UniFi Enterprise System to provide cost-effective, reliable routing and advanced security for your network.

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Ubiquiti Unifi Security Gateway Review 2019: When and Why We Use the USG Firewalls.
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When comparing Security Gateway and Opalstack, you can also consider the following products.

Learn about Proofpoint's email security solutions that protect organizations against threats such as email fraud, phishing, spam, bulk email, and viruses.
Compare Proofpoint Email Security and Protection to Security Gateway or Opalstack:

Barracuda's Email Security Gateway is a powerful antivirus filter specifically designed to identify and eliminate email-borne threats, stopping hazards before they reach the network.
Compare Barracuda Email Security Gateway to Security Gateway or Opalstack:

Symantec Email Security.cloud provides always-on, inbound and outbound email security against malware, targeted attacks, and advanced threats
Compare Symantec Email Security.cloud to Security Gateway or Opalstack:

Cisco Email Security protects against ransomware, business email compromise, spoofing, and phishing.
Compare Cisco Email Security to Security Gateway or Opalstack:

Area 1 identifies and prevents advanced socially engineered attacks before they impact your enterprise.
Compare Area 1 Security to Security Gateway or Opalstack:

Barracuda Essentials offers advanced Office 365 security features including email scanning, archiving, backup & recovery, and real-time phishing defense.
Compare Barracuda Email Protection to Security Gateway or Opalstack: