This is Exchnage 2016 deployment. For some reason out IP has been in banned sending IP lists.
We've tried the O365 Anti-Spam IP Delist Portal. We first tried this around 5 hours ago. At which point we were told that in about 30 minutes the IP address would be delisted. However, the problem continued, so we've tried again (and again etc). Now when we try to delist we get a message saying "The request to delist IP address XXX has been denied and we have escalated your request to Microsoft support. However, there's no information on turnaround time or how to contact the correct Support team.
This issue is huge for us - we are unable to contact numerous clients and candidates until it's resolved.
We aren't currently Office 365 customers (though we are considering this as a solution). we are right now using Microsoft Exchnage 2016. Is there any other way we can expedite unblocking our IP address.