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Off-site notifications to Exchange online

digimonx
Regular Advisor

Off-site notifications to Exchange online

We have NBX 100 configured and working fine for off-site notifications with our on-site Exchange server. We migrated to Microsoft Office 365 and would like to retire on-site Exchange server. I changed the DNS IPs on nbx to external DNS that has MX records pointing to MS Exchange online service, but we do not get the off-site notifications. I have DNS and SMTP from NBX to any external open on the firewall, but I do not see any traffic going out from NBX when it has external DNS IPs in the system settings. When I switch NBX back to internal DNS IPs, all works fine.

Any ideas? Thanks!