When trying to start Amavis you see this in the mail log:
Oct 02 03:20:15 condor3648 systemd[1]: Starting LSB: Starts amavisd-new mailfilter...
Oct 02 03:20:16 condor3648 amavis[1697]: starting. /usr/sbin/amavisd-new at condor3648.startdedicated.com amavisd-new-2.11.0 (20160426), Unicode aware, LC_ALL="C", LANG="en_US.UTF-8"
Oct 02 03:20:16 condor3648 amavis[1705]: (!)Net::Server: 2020/10/02-03:20:16 Can't connect to TCP port 10024 on ::1 [Cannot assign requested address]\n at line 64 in file /usr/share/perl5/Net/Server/Proto/TCP.pm
Oct 02 03:20:16 condor3648 amavis[1690]: Starting amavisd: amavisd-new.
Oct 02 03:20:16 condor3648 systemd[1]: Started LSB: Starts amavisd-new mailfilter.
To fix this edit the file /etc/amavisd/warden.conf on Centos/RHEL/Cloudlinux/AlmaLinux or /etc/amavis/conf.d/99-warden on Debian/Ubuntu and add the following line:
$inet_socket_bind = '127.0.0.1';
Now restart Amavis:
Centos/RHEL/CloudLinux/AlmaLinux
systemctl restart amavisd
Debian/Ubuntu
systemctl restart amavis