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Yes you can add a smart host if you choose to in that order. We actually send traffic from Office 365 tenant to our inbound gateway which is hosted by a 3rd party (not O365) and from their into our on-prem exchage so it goes o365 &gt;&nbsp;3rd party hosted inbound gateway &gt;&nbsp;on-prem exchange.<br />
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You don't need to do anything special for ports, as long as ports 443 and 25 are accepted by your firewall and forwarded to Exchange you will be fine. Those are the ports that O365 require and I'm sure those ports are already being forward to your exchange servers.
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Hi All,<br />
<br />
We’re in a process to push office 365 hybrid configuration wizard to configure Exchange hybrid.<br />
<br />
1. Is there any way we don’t directly expose our on-Premises Exchange servers to office 365? <br />
<br />
2. Is there any requirement to open port 25 or port 80, 443 between office 365 servers and on-premises Exchange servers?<br />
<br />
3. Can we make change into send and receive connectors after ruuning hybrid configuration wizard. It creates for us?<br />
What we’re trying to achieve here is — Office 365 —&gt; smart Host —&gt; Exchange on-premise!<br />
<br />
<br />
Thanks for taking your time to respond...
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Hi All,

We’re in a process to push office 365 hybrid configuration wizard to configure Exchange hybrid.

1. Is there any way we don’t directly expose our on-Premises Exchange servers to office 365? 

2. Is there any requirement to open port 25 or port 80, 443 between office 365 servers and on-premises Exchange servers?

3. Can we make change into send and receive connectors after ruuning hybrid configuration wizard. It creates for us?
What we’re trying to achieve here is — Office 365 —> smart Host —> Exchange on-premise!


Thanks for taking your time to respond...

Office 365 hyrbid configuration.

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.