Debian Linux Security Advisory 2021-2 – spamass-milter with -x, a zombie process is left around for every mail received. This update corrects this problem.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/88958/dsa-2021-2.txt
Source: https://packetstormsecurity.com/files/88958/Debian-Linux-Security-Advisory-2021-2.html