Whitelist Senders and domains in office 365 to bypass Spam filters

Introduction

Office 365 provides  number of tools to maximize the security to secure corporate information based on unique business and technical needs. When built-in Office 365 filters over qualify suspected SPAM, there are a few simple steps administrators can take to whitelist senders and domains in Office 365 to bypass spam filters. It can be a bad experience for end users when legitimate email is being quarantined or blocked as spam and landing in a quarantine folder.

It’s recommended that you being an admin should review your filters so that critical messages bypass the spam folder and reach their intended recipients

You can leverage a safe sender list or a custom transport rule to bypass spam filtering and prevent legitimate email messages from getting marked as junk. Marking a legitimate message incorrectly as spam by the spam filter is known as false positive.

Whitelist Senders and Domains in Office 365

To whitelist senders and domains in office 365 to bypass the spam filter requires you to perform the following steps.

Whitelist Senders and domains in office 365 to bypass Spam filters

  • Scroll down to the bottom and expand “Allow List

Whitelist Senders and domains in office 365 to bypass Spam filters

 

  • Click on “Edit” button to add the Allow Sender and Allow Domain list

Whitelist Senders and domains in office 365 to bypass Spam filters

  • Once the users email address is added, click on button to add the users to the safe sender list

Whitelist Senders and domains in office 365 to bypass Spam filters

Emails from safe sender list users will not be checked for spam filters and be delivered to recipients

  • Once the safe sender list of users is configured, next step is to configure the safe sender domain list.
  • Click on “Edit” button to add domains to allowed domain list

Whitelist Senders and domains in office 365 to bypass Spam filters Whitelist Senders and domains in office 365 to bypass Spam filters

  • Once the domains are added, emails from these domains will not be checked by spam filters and delivered to users

It’s important to understand that when you add a safe user or domain to the list, you must know the user or domain is legitimate and will not send you a spam email that can harm business operations. Mostly these lists are being configured for business partners or internal applications when sending an email leveraging another media to deliver the emails to mailboxes hosted on Office 365 or systems leveraging exchange online protection to scan the emails before those are being delivered to end user mailboxes.