Cannot validate any hostnames, skipping Let’s Encrypt for 1 hour

I like everything about Mailcow except the Let’s Encrypt process. It is so cumbersome and it is a hit or miss when it comes to renewal. My Mailcow Docker instance Let’s Encrypt cert was up for renewal last night and it never renewed. Gave me some errors about my browser’s time was ahead and then the logs has some messages about not connecting to my IP. I wish Mailcow’s team would improve the way they implement the Let’s Encrypt process. I spent three hours trying to figure it out (i.e., . modifying the TZ, ducker down and up). Then reinstalled Mailcow on a clean Debian 12. Thinking that would solve the issue. Ran the docker compose up -d (down) edited the config file with my mail server domain and the silly thing could never assign a cert. DNS were right, reverse IP was right. I even disabled fail2ban and ufw and no luck. Finally I gave up and install a different mail server (will not post here which one because it is not fair to the Mailcow team to promote some other open source mail server). This is a temporary solution until Mailcow can update or modify the process of issuing and renewing the Let’s Encrypt cert. I will go back to Mailcow because it is a great docker mail server.
Sorry to have to put this here. Like I said. I like Mailcow and will go back to it as soon as they change the way the Let’s Encrypt cert are issued and renewed.