I am trying to install mailcow following this guide
Tutorial: How to Install and Configure Mailcow (Mail Server) - Bennet Richter
bennetrichter.de
Upon “docker-compose up -d” I received this error:
Error response from daemon: driver failed programming external connectivity on endpoint mailcowdockerized-postfix-mailcow-1 (d5e85e2b810433a112562f98e366458954803baa733a098cb7ff09d564e09a7a): Error starting userland proxy: listen tcp4 0.0.0.0:25: bind: address already in use
Upon running netstat i learned that it was running exim4
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1094/exim4
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 25407/docker-proxy
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 25426/docker-proxy
tcp6 0 0 ::1:25 :::* LISTEN 1094/exim4
tcp6 0 0 :::443 :::* LISTEN 25412/docker-proxy
tcp6 0 0 :::80 :::* LISTEN 25430/docker-proxy
I don’t remember installing exim4 before this and I also don’t remember it being a requirement on the docs so I’m not sure if I can just uninstall exim4 or how to fix it. I found the error on the official website under 
Common Problems - mailcow: dockerized documentation mailcow.github.io
however the link it redirects to for a fix is no longer available. Could someone please assist me in this ?
