EMAIL-014: External Recipient Warning
- Platform
- Google Workspace
- Category
- Advanced Threat Protection
- Severity
- Medium
- Zero Trust pillar
- Applications & Workloads (weight 1)
- Golden fixtures
- 1
- Branch coverage
- Observed: fixtures prove the verdicts they exercise
- Provenance
- baseline
What it checks
Users should be warned when sending email to recipients outside the organization to prevent accidental data disclosure and social engineering
Recommended value
External recipient warning enabled for all users
Remediation
Admin Console > Apps > Google Workspace > Gmail > End User Access > Enable 'Warn users when they send messages outside the domain'
Fixture-proven verdicts
Every verdict below is proven by a golden fixture in the module's gating test suite. This table derives from the last green run; it cannot be edited by hand.
| Scenario | Expected verdict |
|---|---|
| always-warn | WARN |
Framework mappings
- NIST SP 800-53
- AC-4, AT-2
- CIS Benchmark
- 2.14
- MITRE ATT&CK
- T1048, T1567
Zero analytics. Zero tracking. Zero cookies. This site makes no external requests, so there is nothing to consent to.
Guerrilla is free and open source. · Validation
Guerrilla is written and maintained by Jim Tyler. This copy lives on jimtyler.org; the project also publishes at guerrilla.army.