Proofpoint Blocking Mailprotector IP Addresses?

Over the past month or so, Proofpoint’s Dynamic Reputation List has blocked Mailprotector IP addresses roughly 10 times or so, Mailprotector alleges. The blockage could trigger some email delivery challenges for channel partners and their customers.

In each case, no spam has been detected by Mailprotector’s outbound filters, and there is no explanation for what triggered the blocked IP, Mailprotector says. In at least eight of the occurrences, the block was placed on different IP addresses.

Mailprotector continues to take "immediate action to minimize the disruption to senders." Proofpoint recipients also suffer because they do not receive potentially important messages, Mailprotector asserts. "The frequency of these disruptions from a company that provides email security is disappointing," according to a Mailprotector statement to ChannelE2E.

ChannelE2E reached out to Proofpoint for comment multiple times on June 27 and 28, but we received no reply. We will potentially update this article if/when we receive a reply.

Proofpoint (Sunnyvale, California) is a security and compliance company that offers cloud-based solutions that protect users from attacks delivered via email, social media, mobile, and cloud applications. Mailprotector (Greenville, South Carolina) offers cloud-based email security, management and hosting services sold exclusively through the channel.

Joe Panettieri

Joe Panettieri is co-founder & editorial director of MSSP Alert and ChannelE2E, the two leading news & analysis sites for managed service providers in the cybersecurity market.