If you need to amend the list of excluded domains you can use: Set-ExternalInOutlook -AllowList ""} To add domains to the exclude list you can use the following PowerShell command: Set-ExternalInOutlook -AllowList ""}Įxclude domains from being labelled as External with PowerShell It is possible to exclude emails from certain domains being marked as external, this might be useful if you work closely with other organisations or you have multiple 365 tenants. Enable external tag with PowerShell Exclude domains from the external tag It can take 48 hours for this setting to start to take effect. To verify the settings, you can use the following PowerShell command: Get-ExternalInOutlook Connect-ExchangeOnline -userPrincipalName next step is to enable the external tagging feature in Exchange Online the following PowerShell command will action that: Set-ExternalInOutlook -Enabled $true You will need the Exchange Online PowerShell modules installed - if you don't have them installed, check out my blog post to do that. The first step is to connect to Exchange Online. Outlook Mobile App – iOS and Android – version 4.2111.0 and higher.Outlook for Mac – Version 16.47 and higher.Outlook for Window – rollout started May 2021.The external tag feature is a new one it is visible and supported by the following versions of Outlook: Supported clients of the External Email Tag Enabling this feature means you can flag emails asking the recipient to "update your password" or similar. This allows you to show a custom warning based on words in the subject or body. The second option is a custom warning banner at the top of the email. This will allow a built-in warning between the subject and body of the email when the email is from someone outside your organisation. The first option is to enable the external email tag in Exchange Online. I would personally recommend enabling both possibilities. There are two options to enable and implement an external sender warning. You can prevent that by adding an external email warning or tagging external emails using Exchange Online's feature. With the ever-increasing number of phishing emails, it's a good idea to help users easily spot emails sent from someone external to your organisation.
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