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To whitelist a domain in Office 365, users must

1. Click on the “Admin” drop-down box found on the top of the display
2. Click on “Exchange” and click the “Mail-Flow” heading
3. Select “Bypass spam filtering” on the menu after clicking on the plus icon
4. Write a new name for the rule in the text box. “Whitelisted Domains” is an excellent choice
5. From the “Apply this rule if” drop-down box, choose “The Sender domain is”
6. Enter the domain that should be whitelisted. The whole email address should not be included, only the domain such as xyz.com or gmail.com
7. Click “Ok”
8. Check the “Stop Processing More Rules” Option and click Save

Along with the whitelist feature, Microsoft offers various other Office 365 spam filter advanced options that allow users to configure and manage their anti-spam settings. These include choices that “increase spam score” if characteristics such as Linked images, Numeric IP addresses, URL to .biz sites, and so on are found in the email. There are also options to mark some emails, such as empty emails or those that have JavaScript as spam.

Some Office 365 spam filter best practices to get the best out of the service include

• Set-up multi-factor authentication (MFA) on all accounts.
• Set up Advanced Threat Protection (ATP) for all Office 365 mailboxes.
• Users must be educated to flag phishing emails to train the system. Suspicious emails should be marked as junk.
• Add warnings when external emails from outside the organization arrive.
• To combat phishing, set up rules for blocking or warning about emails that seem to be similar to a user’s domain but are not from it.
• For enhanced detection, enable the auditing and logging of user activities in all areas possible.
• Dedicated spam filtering and secure messaging solutions can be implemented for advanced protection.
• Follow the Principle of Least Privilege.

Office 365 is an excellent cloud-based platform that fulfills all requirements of enterprises. It has several features that make it right for users. For instance, for preventing outbound spam office 365 has built-in filters. Such spam filters in Office 365 should be leveraged to their full extent, and best practices should be followed to ensure that spam emails do not interfere with the operations of an enterprise. Although the Office 365 spam filter is handy, it can block legitimate email communications. Setting up the Office 365 Spam Filter Whitelist is the best solution to allow desired messages to pass through the filter.

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