17-05-2021 12:53:34 PM (BST)
The temporary Pop Legacy hostname is no longer available for use on the platform. If you are aware of this address being used across POP, IMAP or SMTP protocols for any of your local applications, please ensure this is updated. Information on the correct hostnames is detailed in the POP, IMAP & SMTP Proxy guidance. Further guidance on the necessary pre-requisite steps, including IP’s that must be allowed, is detailed in the Required Firewall and Proxy Server Changes for Exchange Online Service guidance. If you do not remove the use of this address, you may experience disruption with your local applications.