Mail Server Dovecot-install

I just installed the mailserver, but there was a Dovecot-Install error, then I repaired it and it failed. I am using Centos 7

Hello, the CentOS 7 official source has been deleted. Would you like to replace it with an available source?

yes, the most important thing is to be able to use mailserver on my vps.

yum install postfix postfix-sqlite cyrus-sasl-plain dovecot postfix-pflogsumm rspamd -y

I run the command above, the following error appears

Hello, is it possible to use this website to search for the dependencies that need to be installed and install them manually?
https://pkgs.org/