We've had a solid Mitel 5000 CP system in place for the past few years. Maybe about 4 months ago, we started to notice delays in receiving email voicemails. The voicemails seem to average around 30 minutes as a delay but some emails can take over an hour for the email to arrive.
We are relaying the emails off a web server to O365. The web server relays other emails from other sources like Sharepoint with no problems. I have checked the firewall for anything being blocked and even created a rule to let all the traffic from the Mitel controller to the web server be unblocked as a test, but that still didn't fix the problem.
Anybody else experience this problem?