Fail2ban jaul not working for postfix-sasl

OS type and version Ubuntu Linux 20.04.3
Webmin version 1.984
Virtualmin version 6.17-3
Related packages Fale2Ban 0.11.1


I have just upgraded Ubuntu 18.04 LTS to 20.04 LTS and after having resolved most of the issues I am now stuck with fail2ban.

I did some research and found many people have had this issue in past but everyone took a different approach to either get it resolved or there has been no formal closure on few of the posts.

For example, I am facing this exact problem posted here in the link below but this post was closed without a resoolution.

Can someone pls let me know if how I can fix postfix-sasl issue? I am not sure how to use iptables or firewall? I am not been sure what I was using in the older version Ubuntu18.04 + Fail2Ban 0.10.2 but it was working perfectly fine and I could see rogue ips hitting my jail and getting blocked, which is not happening anymore.

I am happy to share content of my jail.local or fail2banl.conf file.

Not sure if I need to write up or make any changes/adjustments in filter.d and action.d folders/files as well. So can someone pls share the full details. We can probably use it as sticky for newbies who joins this community in the coming days.

Many Thanks,

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