Due to a temporary relocation of my mailcow server I have to change the MTU 1500 to 1450. I changed the MTU in the host and thought that everything was OK. Today i realized that the containers have issues downloading updates and stuff and even the list of root server.
I searched the documentation for MTU and found https://mailcow.github.io/mailcow-dockerized-docs/i_u_m/i_u_m_install/
Section 4.1 seems to describe how to change it.
I added this line to the network configuration section in docker-compose.yml:
If i then run docker-compose up -d i get this message:
ERROR: Network “mailcowdockerized_mailcow-network” needs to be recreated - option “com.docker.network.driver.mtu” has changed
I’m a bit new to docker. What is the procedure to recreate the network?