Forum Discussion
Exchange online users can't send or receive email in Hybrid configuration.
Hello, I'm testing a hybrid deployment with Exchange 2019 on prem. The hybrid setup seemed to go smoothly and I can migrate mailboxes between on-prem and online and back again. The problem I'm hav...
Thanks Dan.
Centralized mail transport is Not enabled, so email to the internet should route directly out of Exchange Online, yet I get the "Access denied, traffic not accepted from this IP" bounce back.
There are 2 connectors in Exchange online, Inbound (Your Org to O365) and Outbound (O365 to Your Org). The Outbound connector successfully validates and the on-prem mailbox receives the validation email. Inbound mail from the internet routes through the on-prem server and are delivered to the online mailbox, so the Inbound connector looks like it's working too.
You've said you're only testing hybrid.....so it's possible the problem is outlined here https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-700-through-5-7-750#57708-access-denied-traffic-not-accepted-from-this-ip