In the event that a customer is using Zix as a secure webmail application as opposed to Sentinel Messaging ‘Advanced Package’ encryption solution, we do support the configuration on the platform. To avoid any potential delivery issues please ensure the IP addresses listed below are added to the sending servers list.
Go to Company Settings > Domains > New Sending Server > Add IP address > Click on save
Link to Zix IP ranges
Zix Secure Message Portals will use a variety of IP address:
The Secure Message web sites are typically in the below IP range:
Notices sent from the portal will typically come from smtpout.zixmail.net, (which is IP addresses 188.8.131.52 through 184.108.40.206) but can also come from one of the above ranges as well.
Note that this list may be updated by Zix and is correct as of publishing, refer to Zix website for most up to date IP list and add accordingly.
**Correct as of January 2018**