When a certificated based connector is not working

I recently worked with an organization that had an Exchange Online inbound connector which accepted mail from their on-premises Exchange environment. This connector was scoped by IP, and the organization wanted to change it to be scoped by certificate instead due to an upcoming change in Exchange Online. For more details on this change see…

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Upcoming Exchange Online connector changes pushed back

Today we announced that the connector changes that were planned for Exchange Online have now been pushed back from February 1st 2017 to July 5th 2017. These changes impact Exchange Online inbound connectors and require organizations with certain configurations to make changes and updates. The original blog post and KB article have both been updated…

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EOP IP Address Additions – March 2015 Edition

This is a quick public service announcement before the weekend starts. Exchange Online Protection has been allocated a new IP range. Starting in 30 days, EOP will add 40.107.0.0/16 to the IP pool that is used to deliver mail that passes through custom connectors (ex. EOP outbound connector which routes inbound mail to your on-premises…

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IP Ranges Added to EOP

On TechNet we publish the range of IP addresses that are used when sending mail out of a custom EOP connector. If you have created an EOP on-premises connector to deliver inbound mail to your on-premises mail environment, or an EOP partner connector to deliver mail to a partner, the IPs used in these situations…

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Inbound Connector Configuration You’ll Want to Avoid

I recently worked with a customer who had a configuration in their EOP outbound connector that broke inbound mail for a newly added domain. I want to share this tale in hopes that you not only learn more about EOP partner connectors, but that you decrease the change of breaking your own mail flow. So…

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On-Premises Delivery Failover

Organizations with on-premises mail environments often will have a primary site and at least one backup site. When Exchange Online Protection is being used to protect those on-premises mail environments, the ideal configuration would have EOP only delivering mail to the primary on-premises site, and only to the backup site if the primary site goes…

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Outbound Connector Smart Host Behavior

If you have an on-premises mail environment that you are protecting with Exchange Online Protection (EOP) then you’ll need to create some connectors in the cloud. This article is going to focus on EOP Outbound Connectors and how they deliver mail when configured with a smart host. Keep in mind that with EOP connectors, the…

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TLS, Connectors, and You

Update (September 3, 2014) I was recently involved in a case where a customer needed more information about the certificate that EOP presents. Being the nice guy that I am, I wanted to share it here! As mentioned in this article, the CN of the certificate that EOP presents is mail.protection.outlook.com. The certificate also contains…

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