If you are an Exchange Online or Exchange Online Protection (EOP) customer and you have configured connectors, this post contains important information that might impact your organization. To make ...
Updated Jul 01, 2019
Version 2.0
Blog Post
5 MIN READ
Important notice for Office 365 email customers who have configured connectors
@Carolyn Liu
We have an organization that's a subdomain of our primary domain, for example we are contoso.com, they are subdomain.contoso.com. We have configured their domain in O365 and have them setup as an accepted domain in Exchange of type "internal relay".
We receive messages on their behalf, perform message hygiene and then pass the email to their server server1.subdomain.contoso.com. The emails are typically to lists, so server1 expands the email and sends it to each expanded recipient. This would be very similar
to your forwarding scenario above.
Server1 is also using O365 as a smarthost with an IP based connector. Would we need to use certificate authentication?
Thanks!