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[solved] How to Whitelist a trusted Domain to Bypass the Spam Filtering in Microsoft office365

Problem

Emails from the trusted domain are getting filtered by the Spam filter in ofifce365 and are not making to the inbox. every message that comes in is assigned a spam score which then determines if the message is legitimate or should be blocked by spam filtering feature in office365.

Per MS articles “That score is mapped to an individual spam confidence level (SCL) that’s added to the message in an X-header. A higher SCL indicates a message is more likely to be spam. EOP takes action on the message based on the SCL.”

Solution

you can use the transport rules in the office365 to change the SCL short for spam confidence level. setting the SCl score to -1 will skip spam filtering if you know that the email is coming from a trusted location or a trusted domain.

Once you have the IP from the trusted domain, here is how you can create and apply the rule.

  1. Log on the office365 portal and go to “Exchange and mail flow”
  2. Once you click mail flow, you will see “rules”
  3. Click on rules and click on + sign to add a new rule.
  4. Choose “Bypass spam filtering” from the option to create the rule.
  5. Name the list and choose a condition which could IP or a domain.
  6. add action to set the SCL to -1.
  7. Choose the mode to enforce
  8. Under Match sender address in message, choose header or envelope.
  9. click save to save the rule.

Thanks for reading the article.

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