Here are some of the highlights from February 2021 release of Adobe Campaign Classic -
Email Feedback Service (EFS) is a scalable service which captures feedback from the Enhanced MTA directly, thus improving reporting accuracy. This capability is released as a private beta and will be progressively available to all customers in future releases.
The console authentication mechanism has been improved to optimize security. (NEO-26944)
Fixed a security issue to reinforce protection against Server Side Request Forgery (SSRF) issues. (NEO-28532)
Salesforce API version 49 is now supported when using Salesforce CRM external account.
The Technical Deliverability Monitoring report is now deprecated.
Check here for detailed update on Security enhancements, Compatibility updates, Deprecated features, Improvements, Other Changes, Technical Evolutions, Patches and Fixes: Release 21.1.1 - Build 9277