Setting up a CentOS server to distribute via auto-script.sh.x?

Question

Mail server

Good afternoon! Guys need your help, hint or advice. I will be very grateful and thankful to everyone.
The task is the following: Set up a server on CentOS to send messages.
There is a MailWizz script, it is located on the VDS, the sending server is separate, from another provider. I fought with my hands for a week and could not do anything. The sending server was not confirmed. I don't understand much about this issue. Then I came across on one of the forums, the auto-script.sh.x script, which sets up the server and installs RMTA. I found this script, but there are two links there, one leads to downloading from the RMTA server, the second is not clear what, but is connected with the server file system. Probably setting up and loading files, because after installing and completing the script, the folder on the custom server with the domain name is empty, but should be with files. Most likely, this is why the result is zero, the script works without errors, green "OK" is everywhere, and it does not even register records in DNS. In general, these are all links in the Blocknet script itself. I figured out one and it is now working and the file is loaded during the installation process - this is RMTA. And with the second what to do - I'll never know (Configuring the server file system). I googled and realized that I didn’t understand anything, there is apparently a script that loads and configures the server file system. I'll attach a screenshot to the post. Friends tell me how to solve this problem? Maybe someone has such a script and, accordingly, experience with it. Is it possible to partially use this script, for example, only configure the server, without installing RMTA? how can I solve this problem? Maybe someone has such a script and, accordingly, experience with it. Is it possible to partially use this script, for example, only configure the server, without installing RMTA? how can I solve this problem? Maybe someone has such a script and, accordingly, experience with it. Is it possible to partially use this script, for example, only configure the server, without installing RMTA?