What are enterprise email gateways?

Enterprise email gateways are dedicated security systems that process all email entering or leaving an organization. They sit at the network perimeter, filtering threats before they reach internal mail servers or users.

Major gateway solutions include Proofpoint Email Protection, Mimecast Secure Email Gateway, Barracuda Email Security Gateway, and Cisco Email Security. Organizations route their MX records to these gateways.

Gateways provide centralized control over email security. They handle spam filtering, malware scanning, phishing detection, data loss prevention, and encryption enforcement in one place.

For senders, gateways represent an additional filtering layer beyond the final mailbox provider. Understanding enterprise gateway behavior is essential for B2B deliverability.

The enterprise gateway is the outer fortification. All mail must pass through before approaching the inner systems.