Here is a list of issues that were fixed in this release - build PROD_2021_w49.

Issue Key Description
AVSUPPORT-64653 Some characters on an email subject were truncated when the email was delivered, due to wrong processing.
AVSUPPORT-56047 Click Time Protection did not rewrite a malicious URL due to wrong email content type processing.
AVSUPPORT-19204 Manual reclassification of emails as malware/phishing did not trigger a policy recheck.