Docker + Fail2ban + Simple Mail Forwarder - you never know what to expect

So I found this awesome project Mail Forwarder

What it does - is forwards e-mails from any mask to a pre-defined e-mail of your choice.

So it’s easy to give your e-mail to someone else and everyone have a unique one.

Hashtag Things could be much easier - there were hints that I did not put attention at the moment:

• Docker logs are stored to a special folder /var/lib/docker/containers/<container name>/<container name>.json file. (or syslog). They start from {"log":". Regex patterns should be updated.
• Docker container timezone and time does not correspond to a system timezone. It can have UTC timezone and host machine can have anything else.
• Docker uses it’s own IPTABLE rules. So fail2ban IPTABLE rules does not apply easily with docker. fail2ban solution
• Sendmail is required by default and banaction would fail if sendmail is not present or is not started, etc. -> Had to remap port for docker application.
• Docker requests are coming from ip 172.17.0.1 - which is not internet IP but rather Docker Gateway. (Which is caused by IP masquerading)