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How to Create an Exchange Online Rule to Bypass Spam Filtering

Natalie Taylor Oct 12, 2026 869 views

Question details

A Microsoft 365 administrator needs to configure a mail flow rule to ensure that specific incoming emails are not caught by the spam filter.

How to Create an Exchange Online Rule to Bypass Spam Filtering

Product: Microsoft Exchange Online
Device & OS: not provided
Scenario: Setting up email routing and spam policies in the Exchange Admin Center to whitelist trusted senders or specific message conditions.
Observed behavior: Legitimate messages may be incorrectly marked as spam, requiring an administrative override to bypass the default spam filtering behavior.

Before you start

Ensure you have Exchange Administrator or Global Administrator privileges in your Microsoft 365 tenant before attempting to modify mail flow rules.

Solution 1Recommended

Create a Bypass Rule in the Exchange Admin Center

Use the Exchange Admin Center (EAC) to define specific message conditions and apply an action that bypasses standard spam filtering.

By setting a rule that modifies the Spam Confidence Level (SCL) to -1, you instruct Exchange Online Protection (EOP) to skip spam filtering for messages that match your defined criteria.

Sign in to the Exchange Admin Center

Navigate to Mail Flow Rules

In the left-hand navigation menu, click on 'Mail flow' and select 'Rules'.

Add a New Rule

Click the 'Add a rule' button and select 'Create a new rule' from the dropdown menu to open the rule configuration window.

Define the Message Condition

Under 'Apply this rule if', choose the relevant condition for the messages you want to whitelist, such as 'The sender domain is' or a specific SCL value.

Set the Bypass Action

Under 'Do the following', select 'Modify the message properties', then choose 'Set the spam confidence level (SCL)'. In the flyout menu, set the value to 'Bypass spam filtering' (-1).

Save the Rule

Add any additional required conditions or exceptions, specify the rule enforcement mode, and click 'Save' to apply your new mail flow rule.

Create a Bypass Rule in the Exchange Admin Center

Scope Your Rules Carefully: Be extremely specific when defining bypass conditions (like matching exact sender domains or IP addresses) to prevent malicious emails from bypassing security checks and reaching your users' inboxes.

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Frequently Asked Questions

What does setting the SCL to bypass spam filtering actually do?

Setting the Spam Confidence Level (SCL) to 'Bypass spam filtering' assigns a value of -1 to the incoming message. This instructs Exchange Online Protection (EOP) to skip the spam, spoofing, and phishing filters, delivering the email directly to the recipient's inbox.

Can I bypass spam filtering for just one specific user?

Yes. When creating the mail flow rule in the Exchange Admin Center, you can set the 'Apply this rule if' condition to 'The recipient is', and then specify the individual user's email address.

How long does it take for a new mail flow rule to take effect in Exchange Online?

While newly created or modified mail flow rules usually begin processing within a few minutes, it can sometimes take up to 30 minutes for the rule to replicate and become fully active across the entire Exchange Online infrastructure.

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