Sometimes Exchange can be a little overzealous in protecting you from spam and other unwanted email. To make sure messages get through, you can whitelist email addresses in Office 365.
Whether you’re new in the IT Environment or an IT Pro getting started managing Office 365 Admin center, here are a few tips on how to do white list an email address or domain in Exchange Online or Office 365. Believe me, it is pretty easy to do.
The new way to whitelist email addresses in Microsoft Exchange Admin Center is by going to Microsoft 365 Security AntiSpam section. This is the link to get there: https://security.microsoft.com/antispam
Click on Anti-spam inbound policy (Default)
The following option will open, scroll down until you can see the option Allowed and blocked senders and domains
Then click on Edit allowed and blocked senders and domains
After you click it, you’ll see the following options below. Click on Allow Domains or Manage Sender(s) to whitelist a domain or a sender.
When you click Manage Sender(s) you’ll see the following below, click on Add senders.
The screen below will open, write the email you want to whitelist, click the name when you’re done writing it. Then click on Add senders
When you click Add senders then click Done.
Then, finally, click Close.
After you click Close you’re done.