# (L1) Ensure MailTips are enabled for end users

MailTips are enabled, including tips for external recipients and for large audiences.

Source: https://maester.dev/docs/tests/CIS.M365.6.5.2

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<div class="test-byline"><div class="test-byline-avatars"><a class="test-byline-avatar test-byline-avatar--author" href="/contributors/jeremyfinney-lgtm" title="jeremy finney · Original author"><img src="https://github.com/JeremyFinney-lgtm.png" alt="jeremy finney" 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/jeremyfinney-lgtm">jeremy finney</a></span><a class="test-byline-link" href="/contributors">All contributors →</a></div></div>

<p class="test-part">Part of <a href="/docs/tests/cis">CIS</a> · Exchange Online · Outlook · <a href="/docs/tests">All checks</a></p>

```powershell title="Run this check"
Invoke-Maester -TestId CIS.M365.6.5.2
```

## Overview

MailTips are enabled, including tips for external recipients and for large audiences.

MailTips show a short warning in the message while it is being written, for example that a recipient is outside the organisation or that the message goes to a large group. The warning prevents misdirected mail and gives the user a chance to stop a message that would leak data.

The test needs all MailTips on, the external recipient tip on, group metrics on and a large audience threshold greater than zero.

CIS does not prescribe one threshold for every organization: its PowerShell audit procedure asks administrators to verify an acceptable value and notes that `25` is the default. This check reports the configured value and only rejects an unset or nonpositive threshold; confirm that any other positive value is suitable for your organization.

#### Remediation action

1. Connect to Exchange Online with `Connect-ExchangeOnline`.
2. Run `Set-OrganizationConfig -MailTipsAllTipsEnabled $true -MailTipsExternalRecipientsTipsEnabled $true -MailTipsGroupMetricsEnabled $true -MailTipsLargeAudienceThreshold 25`.
3. Check the settings with `Get-OrganizationConfig | Format-List MailTips*`.

#### Related links

* [MailTips in Exchange Online](https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/mailtips/mailtips)
* [Set-OrganizationConfig](https://learn.microsoft.com/powershell/module/exchange/set-organizationconfig)
* [CIS Microsoft 365 Foundations Benchmark v7.0.0 - 6.5.2](https://www.cisecurity.org/benchmark/microsoft_365)

## Details

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

| Field | Value |
| --- | --- |
| Test ID | CIS.M365.6.5.2 |
| Severity | Low |
| Suite | CIS |
| Product | Exchange Online |
| Feature | Outlook |
| Area | Email and collaboration protection |
| Resource type | Tenant |
| User impact | Low |
| Implementation cost | Low |
| MITRE ATT&CK | None |
| Supports benchmark | CIS Microsoft 365 Foundations Benchmark (version 7.0.0), requirement 6.5.2 |
| Benchmark level | L1 |
| Benchmark profiles | E3 Level 1 |
| Supports controls | cis-m365:6.5.2, nist-800-53-r5:AC-4 |
| PowerShell test | [Test-MtCisMailTipsEnabled](https://github.com/maester365/maester/blob/main/tests/cis/Test.CIS.M365.6.5.2.ps1) |
| Services | ExchangeOnline |

</details>

## Source

- Test: [`tests/cis/Test.CIS.M365.6.5.2.ps1`](https://github.com/maester365/maester/blob/main/tests/cis/Test.CIS.M365.6.5.2.ps1)
- Documentation: [`tests/cis/Test.CIS.M365.6.5.2.md`](https://github.com/maester365/maester/blob/main/tests/cis/Test.CIS.M365.6.5.2.md)