Vormetric Data Security Platform
Azure Key Vault
Egnyte
AWS CloudHSM
OpenSSH
GnuPG
ManageEngine Key Manager Plus
Duo Security
Barracuda Email Security Gateway
Proofpoint Email Security and Protection
Symantec Email Security.cloud
Cisco Email Security
FortiMail
Area 1 Security
Security Gateway
Barracuda Email Protection
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MACsec on Catalyst switches would do it. Either through a point-to-point or some sort of ELAN/VPLS between sites and encrypt traffic over that route. We also use Vormetric between our DCs: https://cpl.thalesgroup.com/encryption/vormetric-data-security-platform but an existing route/connection between sites is required. Good luck. Source: about 3 years ago
Azure Key Vault - Safeguard cryptographic keys and other secrets used by cloud apps and services with Microsoft Azure Key Vault. Try it now.
Proofpoint Email Security and Protection - Learn about Proofpoint's email security solutions that protect organizations against threats such as email fraud, phishing, spam, bulk email, and viruses.
Egnyte - Enterprise File Sharing
Symantec Email Security.cloud - Symantec Email Security.cloud provides always-on, inbound and outbound email security against malware, targeted attacks, and advanced threats
AWS CloudHSM - Data Security
Cisco Email Security - Cisco Email Security protects against ransomware, business email compromise, spoofing, and phishing.