Use the Block or Allow settings to help control unwanted and unsolicited email messages by creating and managing lists of email addresses and domains that you trust and those that you don’t.
From within your Inbox you can quickly Move items to your Junk Mail folder, Block senders from sending you further email or Report items to Microsoft so that they can update their algorithms. These quick choices are available by right-clicking individual items or by selection from the menu bar.
Detailed control over junk email management, such as unblocking senders or creating rules associated with a users domain and not just their specific address or creating a list of safe senders are available within your email settings. As the process is dependant on the current version of M365 we refer you to Microsoft's Support pages for step-by-step instructions...
M365 Manage Junk Email settings
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