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Microsoft 365 Security and Compliance for Administrators
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Not so long ago, if the organization was planning to set up an Exchange Server instance on-premises, they had to plan for setting up both a proxy server and the additional protections for proper filtering of mail traffic. What has not changed with the transition to Exchange Online is that you still require adequately set-up DNS records for authentication of your mail system. The following are the records that you do still need to upload to Exchange Online at the level of your tenant:
Depending on which type of Microsoft Defender for Office 365 plan you have (Plan 1 or Plan 2), there are different options for configuring policies and rules.
Plan 1 has a lot of different options, which can be useful when setting up protection for your mail traffic. The basic settings of Exchange Online Protection, in most cases, are not sufficient to satisfy all requirements...
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