Best Practices for Securing Cloud Email

Microsoft Office 365 and G-Suite are prime targets for cyberattacks.

This brief examines best practices for an effective cloud email security solution.

The fact is, native cloud security is not enough to protect Office 365 and G-Suite users. With the widespread adoption of cloud email, literally millions of users are easy targets for every hacker. Never have there been so many mailboxes with identical security. Hackers leverage the fact these cloud accounts are also sources of authentication to other enterprise SaaS apps.

This is the real and present danger of the cloud security monoculture. What bypasses one bypasses all. Unfortunately, native cloud security is not enough. Secure Email Gateways (SEGs) are not built for the cloud, only secure inbound and outbound email, and broadcast themselves to hackers.

Given the many limitations of securing cloud email with traditional SEGs and security shortfalls within Microsoft filters, a best-practice solution must be cloud-native and designed to augment, not replace, existing security layers. This method ensures that the necessary filtering and new attack signatures are updated continuously, while advanced threat analyses address modern targeted phishing and evolving zero-day attacks.

A best practice solution must:

  • Block harmful messages, URLs, and attachments from reaching the inbox,
  • Scan all emails preventing insider threats from compromised or trusted internal accounts, and
  • Provide synchronous threat management via a Cloud Email Security Supplement (CESS).

Download this document and visit this page for more information about SonicWall Cloud App Security (CAS), a CESS solution that delivers full-suite protection for cloud email and SaaS applications.

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