This may be a cloud-hosted service, or it may be a virtual appliance running inside of the corporate network. For more information, see Great article as usual. In Microsoft 365 and Office 365 mail flow, there are several components of DNS that are particularly important for email authentication and delivery: MX records, SPF, DKIM, and DMARC. For more information, you can again reference If you must point your MX record to another server or service that sits in front of EOP, see At this point, you've verified service delivery for a properly configured Outbound on-premises connector, and you've verified that your MX record is pointing to EOP. The result is that any email dropped off at Office 365 to your domain that is from the outside will be rerouted to the MX record for your domain. It’s a mail flow situation that isn’t necessarily obvious/noticeable until you start digging into O365 mail traces and email headers but, could be pretty important – especially to organizations that have strict compliance requirements. It was surprising (and somewhat disconcerting) to learn this was happening. If you have split setup w/ Mailboxes in O365 and on-Premise and your MX is pointed to a 3rd party device (say another anti-spam provider), any senders who are customers of O365 (I believe their EOP) will actually ignore your MX record and will instead deliver directly to O365. There’s some more detailed documentation on TechNet now for the various mail flow scenarios:We setup a hybrid environment with Exchange 2010, however onpremises users cant send email to some destinations, outlook, google and majority ar ok but with few recipients i got error(O365 accounts does not have this problem):451 4.4.0 Primary target IP address responded with: “421 bosimpinc14 bizsmtp Temporarily rejected.
Centralized transport is often used to meet a compliance requirement, for example journalling all email messages, holding outbound email messages for moderation, or stamping all outbound emails with a disclaimer.The on-premises server used in this topology may also be an Edge Transport server if the organization requires SMTP traffic to traverse a perimeter network instead of internal servers.This scenario of MX records pointing to Office 365 is usually due to one or both of the following requirements:The effect of this configuration is that inbound email is first received by Office 365 where it is scanned by Exchange Online Protection before it is routed to cloud or on-premises mailboxes. Your on-premises server, or a cloud mailbox?If I want to use “SCENARIO 2 – MX RECORDS POINTING TO OFFICE 365” with 1000 mailboxes on-premise and 50 mailboxes in Office 365 (for VIP only for example)Do I have to pay “only” 50 Office 365 subscription (for my 50 Office 365 mailboxes) with a mailflow cleaning done by EOP for my 1050 mailboxes or do I have to pay something else to MS ?Or does MS only apply EOP on my 50 Office 365 mailboxes and redirect to my Exchange on-premise servers the native mailflow (not cleaned) for my 1000 on-premise mailboxes ?EOP is licensed per user. Basically, if you have Exchange Hybrid configured and *think* you have configured it so that all inbound mail routes first through something other than O365, that is likely not the case. The firewall should only allow inbound SMTP to Exchange by the email security device or service, Office 365, or both, depending on the mail routing requirements.As you can see MX records for Hybrid deployments do not have a single solution that fits all scenarios. Later as the migration progresses they may choose to cut the MX records over to MX records pointing at on-premises Exchange is often combined with centralized transport, which means that outbound email from Exchange Online mailboxes is routed via on-premises Exchange as well. I have a client who is primarily on-prem with a few test mailboxes w/ O365. For more information, see After you configured connectors, wait 72 hours to allow propagation of your DNS record updates.
I think this recent outage of the third party provider raised many questions regarding redundancy of the provider and to find some alternatives. I sent a test to myself internally and externally. The original version was created by FrontBridge, which was acquired by Microsoft in 2005.You can get a separate EOP subscription, but EOP is automatically part of any Exchange Online subscription, so you must do the math to figure out the best value for money.EOP can be used for inbound mail and for outbound mail. Our on-premise Exchange 2010 functions but the Office 365 test mailbox is only able to send out but not receive.
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