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Proofpoint, Inc.

Using Zix with Proofpoint Essentials

Situation Can Proofpoint Essentials be used in the Zix mail flow?
Solution One possible way to use Zix secure mail with Proofpoint Essentials outbound. Please ensure the below IP addresses are added to your sending servers list.

One possible way to use Zix secure mail with Proofpoint Essentials outbound

Customers using Zix as a secure webmail application instead of Proofpoint Essentials encryption solution should ensure the IP addresses listed below are added to the sending servers list. We support this configuration on the Proofpoint platform. Adding the IP addresses will help avoid potential delivery issues.

  • Go to Company Settings > Domains New Sending Server > Add IP address

These are the last known IP ranges from Zix. 

This list may not be up to date

Please refer to Zix support for their full IP sets.

  • 63.71.13.0/24
  • 63.71.14.0/24
  • 63.71.15.0/24
  • 199.30.236.0/24
  • 91.209.6.0/24

Notices sent from the Zix portal will typically come from smtpout.zixmail.net, (which is IP addresses 63.71.8.100 through 63.71.8.109) but can also come from one of the above ranges as well.