SpamArrest Email Spam Prevention Program for Office 365 Needed

My friend is using a service called SpamArrest to manage his unruly inbox. Any new senders will receive an email back from the server asking they pass a "capcha" type non-robot test. After that, they're whitelisted and may email freely.

He's moved to Office 365 and SpamArrest isn't compatible.

The goal is a robust email whitelisting cloud service that will work with O365 Exchange and Outlook Desktop Client. Do you know of a product that can meet this need?

Thank you,

John
JohnMan777Asked:
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Vasil Michev (MVP)Commented:
Exchange Online Protection, which is included with O365, works quite well for me. If you need advanced functionality, you can pay the premium price of Advanced Threat Protection: https://docs.microsoft.com/en-us/office365/securitycompliance/office-365-atp

Do note that putting another anti-spam solution in front of O365 requires some additional configuration, and you will loose some of the built-in functionalities as explained here: https://blogs.msdn.microsoft.com/tzink/2016/06/07/hooking-up-additional-spam-filters-in-front-of-office-365/
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JohnMan777Author Commented:
I don't think a product to replace Spam Arrest exists. Thank you for the help though!!!
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JohnMan777Author Commented:
I don't think a product to replace Spam Arrest exists. Thank you for the help though!!!
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