Proofpoint blocking email
It seems that iCloud and @mac.com email servers are using Proofpoint for spam filtering.
We run a web hosting and email service company. Proofpoint has blocked on of our IP addresses. 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. I'm not getting any responses.
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.
The error message being returned by your server - mx3.mac.com.akadns.net (17.172.34.65) - is:
550 5.7.0 Blocked - see https://support.proofpoint.com/dnsbl-lookup.cgi?ip=aa.bb.cc.dd:XX@mac.com
If 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 you can contact Proofpoint about this blacklisting it would be helpful.
I will also note that Proofpoint's lookup on our IP shows:
Most Recently Seen as Spam 03/01/2013 15:06:49 GMT
That was over 3 months ago. Proofpoint is not maintaining their blacklist and is not providing a solid service.
We have filled out their form multiple times. Two times:
05/30/13 - Request ID: 339705 - No Response
06/04/13 - Request ID: 340674 - No Response
If someone from iCloud wants to ask Proofpoint why they are not responding to the submissions on their form, there are two Request IDs.