Exchange hybrid mail flow

I am running a hybrid environment with Office 365. All mailboxes are in Exchange Online and I am trying to minimize my Exchange 2013 footprint on-prem. My programs, printers, and devices point to a D...

exchange online

Exchange Server

hybrid

NunoAriasSilva

MVP

Apr 17, 2018

Hi leng,

Please see the option 3 from the following article to meet your goal https://support.office.com/en-us/article/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-office-365-69f58e99-c550-4274-ad18-c805d654b4c4

Off2w0rk

Brass Contributor

Apr 17, 2018

Thanks Nuno,

i have seen that article and others that is a bit poorly written, at least nothing i can understand well.

What i ended up is the following:

1. In O365 Exchange ECP i edited the connector that is From Organization to O365 to use certificate containing *.domain.com

2. In on-premises exchange ECP, i created a new send connector to use domain-com.onmicrosoft.com as smarthost and also force this connector to use TLS and assigned it the same certificate used for OWA.

Since we have multiple domains, i was afraid using domain-com.onmicrosoft.com wouldn't work, since this is different for each domain. Anyhow, it worked :)

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Exchange hybrid mail flow