Step 1: Open the Exchange Admin Center.
Step 2: Click on Protection.
Step 3: Click on Spam Filter.
Step 4: Double click on Default.
Step 5: Click on Allow Lists.
Step 6: Under Allow Lists, click the + to add a new email address.
Step 7: In the window that pops up, add the address you’d like to let through.
Step 8: Click Save.
Step 9: Click Save again.
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