Liran Zamir's Exchange 2010 blog: Using the Exchange 2010 Anti-Spam feature to block specific IP addresses
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KB5956] Configure Approved (whitelist), Blocked (blacklist) and Ignored (exceptions) lists in ESET Mail Security for Microsoft Exchange
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How to allow list/whitelist/block list/blacklist incoming email address/domain in Microsoft 365 Exchange Online/Exchange Online Protection (EOP) (Or add domain/email address to safe sender list) > Blog-D without Nonsense
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