Temporarily rate limited due to IP reputation.
We have suddenly started receiving the following Mail Delivery Status Notification:
Diagnostic-Code: 4.7.650 The mail server [136.143.184.12] has been temporarily rate limited due to IP reputation. For e-mail delivery information, see
https://aka.ms/postmaster (S3113) [Name=Protocol Filter Agent][AGT=PFA][MxId=11BC538E3127B91C] [DS3PEPF0000C37F.namprd04.prod.outlook.com 2025-11-26T07:18:53.269Z 08DE29C71C2772EE]
Remote-MTA: dns; apc.olc.protection.outlook.com
This only happens when sending to microsoft addresses - msn, outlook, hotmail and live
Is Zoho able to rectify this? We are now unable to even send email to clients who have these email addresses, we can't even respond to those who email us