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Cloud Manager

Gordon Howes

Principal Solutions Architect

Jian An Lim

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So our setup is as follows- Single AD/Forest- 2 x 2016 Exchange servers in a DAG- Hybrid connection to 365 with multiple mailboxes moved already and working fine. We have a trusted 3rd party that currently uses our on-prem exchange server to relay emails a our domain.&nbsp; We are looking to move all relays to 365 including the 3rd party. Our solution architects have said we need to use certificate based authentication and that the process is for the 3rd party to receive and install our exported certificate and install it at their end and create a send connector to use it.&nbsp; I have to try and communicate what is required for the 3rd parties to do, but confess to not understanding it fully.&nbsp;Can someone explain what is required at our end (from a 365 perspective) and what is required at the 3rd party end&nbsp;Thanks
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So our setup is as follows
- Single AD/Forest
- 2 x 2016 Exchange servers in a DAG
- Hybrid connection to 365 with multiple mailboxes moved already and working fine.
We have a trusted 3rd party that currently uses our on-prem exchange server to relay emails a our domain. 
We are looking to move all relays to 365 including the 3rd party. Our solution architects have said we need to use certificate based authentication and that the process is for the 3rd party to receive and install our exported certificate and install it at their end and create a send connector to use it. 
I have to try and communicate what is required for the 3rd parties to do, but confess to not understanding it fully. 
Can someone explain what is required at our end (from a 365 perspective) and what is required at the 3rd party end 
Thanks

Understanding certificate based authentication for email relay in 365

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.