I have the same exact situation as described by other's here. If someone from iCloud wants to ask Proofpoint why they are not responding to the submissions on their form, there are two Request IDs. We have filled out their form multiple times. Proofpoint is not maintaining their blacklist and is not providing a solid service. I will also note that Proofpoint's lookup on our IP shows: If you can contact Proofpoint about this blacklisting it would be helpful. The error message being returned by your server - .net (17.172.34.65) - is:ĥ50 5.7.0 Blocked - see : someone with iCloud's server administration can provide me with a contact email address, I will send you the IP address that is being blocked.

If I were running the iCloud mail servers, I would strongly consider dropping Proofpoint as an email filtering system, since they seem to have fallen off the face of the earth. I have been trying for weeks to get a hold of someone at Proofpoint to get the IP delisted or to provide more information about the blacklist entry. Proofpoint has blocked on of our IP addresses. We run a web hosting and email service company. It seems that iCloud and email servers are using Proofpoint for spam filtering.

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