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- How to block emails in office 365 admin portal how to#
- How to block emails in office 365 admin portal windows#
How to block emails in office 365 admin portal windows#
Get-RemoteDomain -Identity | Select TNEFEnabledįor more info about specific Windows PowerShell cmdlets, go to the following Microsoft websites: Run the following WindowsPowerShell command to check that the setting was applied: Set-RemoteDomain -Identity -TNEFEnabled $false Run the following Windows PowerShell command to prevent messages from being sent in rich text format: Run the following Windows PowerShell command to create a remote domain for an external domain:
How to block emails in office 365 admin portal how to#
For more information about how to do this, go to the following Microsoft website: You can also use this method to change the message format for messages that are sent to coexistence domains.Ĭonnect to Exchange Online by using remote PowerShell. This method requires you to create a remote domain object in Exchange Online to control how messages are sent to external domains. Open the Admin centers navigation tree on the left and click on Exchange. Login to Office 365 using an account with administrator rights. Scenario 2: Change the message format for all messages that are sent to a specific domain The main downside that must be considered is that this method does not block users from leveraging the Start/Stop Forwarding function in Outlook Web Access (OWA). Get-MailContact | Select | Select UseMapiRichTextFormat Run the following Windows PowerShell command to confirm that the message format was applied: Set-MailContact -Identity -UsePreferMessageFormat $True Set-MailContact -UseMapiRichTextFormat Never Run the following Windows PowerShell commands to configure the message format as Text Only:
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For more info about how to do this, go to the following Microsoft website:Ĭonnect to Exchange Online using Remote PowerShell To change the message format for an external contact that was added to Exchange Online, follow these steps:Ĭonnect to Exchange Online by using remote PowerShell. Scenario 1: Change the message format for external contacts To change the message format to prevent Winmail.dat attachments, use one of the following methods.
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Office 365 admins can use Windows PowerShell to change the message format to prevent the Winmail.dat attachment from being sent to external recipients. If the recipient’s messaging system can’t process this format, a file attachment that's called Winmail.dat is added to the message. Messaging systems that aren't based on Microsoft Exchange may be unable to interpret messages that use this rich text format. This article describes how Microsoft Office 365 admins can change the message format so that messages that are sent from Office 365 users to external recipients don’t contain Winmail.dat attachments.īy default, email messages that are sent from Exchange Online in Office 365 use the Transport Neutral Encapsulation Format (TNEF) format.