# Safe Links is not bypassed

Microsoft Defender for Office 365 Safe Links can help protect against phishing attacks by providing time-of-click verification of web addresses (URLs) in…

Source: https://maester.dev/docs/tests/ORCA.189.2

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<div class="test-byline"><div class="test-byline-avatars"><a class="test-byline-avatar test-byline-avatar--author" href="/contributors/thomas-s-schmidt" title="Thomas Schmidt · Original author"><img src="https://github.com/thomas-s-schmidt.png" alt="Thomas Schmidt" width="28" height="28" loading="lazy" decoding="async" /></a></div><div class="test-byline-meta"><span class="test-byline-text">Contributed by <a href="/contributors/thomas-s-schmidt">Thomas Schmidt</a></span><a class="test-byline-link" href="/contributors">All contributors →</a></div></div>

<p class="test-part">Part of <a href="/docs/tests/orca">ORCA</a> · Defender · Mail flow · <a href="/docs/tests">All checks</a></p>

```powershell title="Run this check"
Invoke-Maester -TestId ORCA.189.2
```

## Overview

Microsoft Defender for Office 365 Safe Links can help protect against phishing attacks by providing time-of-click verification of web addresses (URLs) in email messages and Office documents. The protection can be bypassed using mail flow rules which set the X-MS-Exchange-Organization-SkipSafeLinksProcessing header for email messages.

#### Remediation action

Remove mail flow rules which bypass Safe Links.

#### Related Links

* [Exchange admin center in Exchange Online](https://outlook.office365.com/ecp/)

## Details

<details>
<summary>Every attribute of this check</summary>

| Field | Value |
| --- | --- |
| Test ID | ORCA.189.2 |
| Severity | High |
| Suite | ORCA |
| Product | Defender |
| Related products | Exchange Online |
| Feature | Mail flow |
| Area | Email and collaboration protection |
| Resource type | MailFlowRule |
| User impact | Low |
| Implementation cost | Medium |
| MITRE ATT&CK | T1566.002 Spearphishing Link, T1204.001 Malicious Link |
| Supports controls | nist-800-53-r5:SI-3 |
| PowerShell test | [Test-ORCA189_2](https://github.com/maester365/maester/blob/main/tests/orca/Test.ORCA.189.2.ps1) |
| Services | ExchangeOnline |
| Compatible licenses | ATP_ENTERPRISE |

</details>

## Source

- Test: [`tests/orca/Test.ORCA.189.2.ps1`](https://github.com/maester365/maester/blob/main/tests/orca/Test.ORCA.189.2.ps1)
- Documentation: [`tests/orca/Test.ORCA.189.2.md`](https://github.com/maester365/maester/blob/main/tests/orca/Test.ORCA.189.2.md)