As a security update to help combat spoofing and unauthorized email, we are making improvements to our Relay Server (relay.appriver.com) on March 1st, 2022. This server was mainly used for alerting or scan to email systems.
The security update will be an SPF record validation on incoming connections to our relay server. The SPF record check will verify the sending IP address is listed in the domain's SPF record. We understand this improvement will require many customers to add their sending IP address to their SPF record. The Set Up a SPF Record for AppRiver Hosted Services article provides more information on setting up an SPF record for Zix|Appriver services. An example of an valid SPF record is below.
Example: "v=spf1 include:edgepilot.com ip4:188.8.131.52 ∼all"
For O365 customers, you will need to use one of the options described in the How to set up a device or application to send using M365 article as O365 is not permitted to use the relay server and can lead to being blocked.