4.11 Ensure MailTips are enabled for end users

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MailTips are informative messages displayed to users while they're composing a message. While a new message is open and being composed, Exchange analyzes the message (including recipients). If a potential problem is detected, the user is notified with a MailTip prior to sending the message. Using the information in the MailTip, the user can adjust the message to avoid undesirable situations or non-delivery reports (also known as NDRs or bounce messages).


Setting up MailTips gives a visual aid to users when they send emails to large groups of recipients or send emails to recipients not within the tenant.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.


To enable MailTips using PowerShell:

Connect to Exchange Online using Connect-ExchangeOnline.

Run the following PowerShell command:

Set-OrganizationConfig -MailTipsAllTipsEnabled $true -MailTipsExternalRecipientsTipsEnabled $true -MailTipsGroupMetricsEnabled $true -MailTipsLargeAudienceThreshold '25'

Default Value:

MailTipsAllTipsEnabled: True MailTipsExternalRecipientsTipsEnabled: False MailTipsGroupMetricsEnabled: True MailTipsLargeAudienceThreshold: 25

See Also


Item Details


References: 800-53|CM-6b.

Plugin: microsoft_azure

Control ID: c08f18a706c9c6d88977d420ee9e4736e6767e439904e347450afccc5d6eeb6a