OFFICE 365 SUPPORT FORUM INSTALL
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For example, maybe your site's contact forms will have problem sending you email to 365. The downside is that you have to check the consequences of the 'Local Mail Exchanger' setting in CPanel. ).ДЄfter that you will be able to use both Office 365 and WHM/CPanel in a hybrid scenario. Keep in mind that in our scenario you must leave Office 365 as the value of your primary MX record (that is.

If you don't do that CPanel sees that the MX record shows to an external mail exchanger (that is Office 365's Exchange Online) and will forward the message back to Exchange Online, creating a loop that will end with an error 'Hop count exceeded'. Then, go to MX Entry and choose Local Mail Exchanger. So, go to your client's CPanel.ДЇirst, you have to edit the TXT SPF record so that both Exchange Online and CPanel's IP address are included. That is all needed inside Office 365 Exchange Control Panel.

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3rd and Working Solution / Install STunnel I use now STunnel which maps the local standard mail ports via a windows service to the secure mail ports used by MS Office 365. The rule should tell that if the recipient is then use the Connector you created. I installed the hMail server (5.4 and 5.5) but after the configuration I figured out that it does not support TLS for the connection MS Office 365. Last, go to Mail flow -> Rules and create a new rule for every contact you created. Then go to Recipients -> Contacts and create new contacts for every single email address you want to use, eg, , etc. Specify the on-premise IP address of your email server and the desired TLS configuration, if any. Tell the connector to be used only when a transport rule is set up (we will create that later). Let's take the scenario that you choose to route all emails to Exchange Online.ДЇirst you need to create a Connector in the Exchange Online ECP. This is done using the MX record, as Jcats mentioned. You can either choose all mails to be routed to Exchange Online or to your on-premise server. When setting up Office 365 on a hybrid scenario between a, let's call it, on-premise server (that is your WHM/CPanel server) and Office 365 Exchange Online you have to take a decision about the primary mail server. That said, let me describe a little better the options. That is because DNS is not the only way to route messages between email servers of the same organization.

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While Jcats's answer is correct when speaking about email routing via DNS, it does not contain the full truth about email routing.

For help & learning (how-to articles, videos, training), please visit Microsoft Support. For technical support and break/fix questions, please visit Microsoft Answers. Also, if anyone has a better suggestion, I would be glad to read it. Your community to share best practices and get the latest news on Office 365. As this thread is quite old, I cannot answer there, so I open a new one hoping this helps both the original poster and any other guy with the same question. My understanding is that as of Oct 31, 2017, RPC over HTTP is no longer a supported protocol for Exchange Online and the new protocol for O365 is MAPI over HTTP. I landed on this thread while searching on Google for the same question as the original poster. Outlook performance counters for MAPI over HTTP.

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