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The third scenario, is a situation in which we want to enable Mail enabled Devices \ Applications address the Office 365 mail infrastructure using a secure communication channel.

Because the Mail enabled Devices\Applications doesn’t support the mandatory requirement for using TLS protocol authentication, we need to use an Intermediary element that will serve as a “logic connector” between the organization Mail enabled Devices\Applications and the Office 365 mail infrastructure (EOP server).

The charter of this scenario is Mail enabled Devices\Applications that have the ability to address the Office 365 mail infrastructure “directly” by addressing the Office 365 entities that represent the Exchange Online mail services that are available for mail clients.

To be able to address the Office 365 mail server – using a secure communication channel, the Mail enabled Devices \ Applications need to have the ability to communicate using TLS protocol provide a user credential of Office 365 users who have an Exchange Online mailbox.

In the former article, we have described a scenario in which we address the Office 365 mail services by using the MX record that represents “our mail server” in Office 365.