DanielJorge wrote:
Is there a way to define all the users passwords at installation time, without using a random string?
Sure, when you finished configuration wizard, iRedMail will ask you to continue or not, you should press Ctrl+C to abort installation process and update a hidden file '.config' with new passwords, then re-execute "bash iRedMail.sh", it will find existing config file and ask you to use it or not, just choose 'y' to use it.
Another simple way is, copy '.config' from your first server. then you got all passwords same as first server.