Proofpoint Dynamic Reputation (PDR) listings and removal
Proofpoint has a block list service named: Proofpoint Dynamic Reputation, or PDR. Proofpoint Essentials utilizes PDR for inbound email. IPs listed on PDR will block a message prior to delivery to the account.
IPs listed on Proofpoint's PDR may receive a bounce back with response blocked by PDR.
Any IP listed on the PDR service can be removed by following the link here. The conditions for PDR listings are also listed on this page.
The main reasons why we may blocking an IP:
Proofpoint Essentials customers IPs listed
Any Proofpoint Essential customer that has their IPs listed on PDR, please open a PDR request ticket first via PDR Removal Request. Upon creating the request, at the end you are given a reference ID. Please open a standard support ticket to Proofpoint Essentials support and include the reference ID indicating you are following up with a PDR removal request.
Data from PDR listings
For data compliance, we may not be able to provide any details regarding why IPs got listed on PDR.
Proofpoint Essentials also use the following block list service therefore customers are advised to check with these services for blocked IP's:
If the sending IP address is blacklisted the sender will receieve a bounce-back from our server. This should make the sender aware that the mail has not been delivered and they should begin the process of getting removed from the list.