How to Add an Email Disclaimer in Microsoft 365
Email disclaimers are commonly used by organizations to provide legal notices, confidentiality statements, regulatory information, or other important messaging at the end of outgoing emails.
If your organization uses Microsoft 365, you can configure a mail flow rule in Exchange Online to automatically add a disclaimer to messages sent by users across the company. This approach allows administrators to manage the disclaimer centrally rather than relying on individual employees to add it manually.
Why Use a Company-Wide Email Disclaimer?
For organizations that require a consistent legal or confidentiality notice, applying a disclaimer at the organizational level is generally more practical than asking employees to add one themselves.
A centralized rule can help ensure that the appropriate notice is added to outgoing messages regardless of which employee sends the email. It can also make it easier for administrators to update the wording whenever company policies, regulatory requirements, or contact information change.
However, an email disclaimer should not be treated as a substitute for security controls or a guarantee against legal liability. Organizations should have their legal or compliance teams review the wording to ensure it meets their specific requirements.
Who Can Configure an Email Disclaimer?
Creating or modifying mail flow rules in Exchange Online requires appropriate administrative permissions. Access is typically restricted to administrators with Exchange or Microsoft 365 roles that allow them to manage mail flow.
This restriction is important because mail flow rules can affect messages throughout the organization. Limiting access helps prevent unauthorized users from accidentally changing how company email is processed.
Administrators can manage these rules through the Exchange admin center, with PowerShell providing another option for organizations that prefer command-line administration.
How to Add an Email Disclaimer in Microsoft 365
Follow these steps to configure a disclaimer for outgoing email:
- Sign in to the Microsoft 365 admin center using an account with the necessary administrative permissions.
- Open the Exchange admin center.
- Navigate to Mail flow and open Rules.
- Select Add a rule > Apply disclaimers to create a new mail flow rule.
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- Give the rule a descriptive name, such as Company Email Disclaimer.
- Under the rule conditions, configure the rule to target the messages you want to receive the disclaimer. If the notice should apply broadly, select the option that applies the rule to all messages.
- Under Do the following, choose the action for adding a disclaimer to the message > Select the option to Apply a disclaimer to the message.
- Click on Enter text to Add your organization’s disclaimer, depending on your requirements e.g.
<hr style=”border:0; border-top:1px solid #444444; margin:10px 0;”>
<div style=”font-size:10px; color:#444444; font-style:italic;”>
The content of this email is confidential and intended for the recipient specified in message only. It is strictly forbidden to share any part of this message with any third party, without a written consent of the sender. If you received this message by mistake, please reply to this message and follow with its deletion, so that we can ensure such a mistake does not occur in the future.
</div>
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- Review the disclaimer carefully, including any links, contact details, legal language, or formatting.
- Select the fallback behavior appropriate for your organization’s requirements, such as Wrap, if that is suitable for your mail flow configuration.
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- Click Next.
- Set the rule to Enforce when you are ready to activate it.
- Save the rule and confirm that you want it applied to future messages.
Tip: Before applying a disclaimer to every message, test the rule with a limited group or controlled mail flow configuration where possible. This can help identify formatting problems, unwanted duplication, or issues with specific message types.
What Does the Recipient See?
Once the rule is active, Exchange Online processes applicable messages and adds the disclaimer according to the conditions you’ve configured.
In most cases, the sender won’t see the disclaimer in their original copy of the message. Instead, it is added as part of the message processing and appears to the recipient, typically near the bottom of the email.
The exact appearance can vary depending on the mail client, message format, and whether the message has been modified or encrypted.