==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):  1.4.0
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: CentOS 7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDb (MySql)
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I have an isssue installing iRedMail v1.4.0 on CentOS 7. After using the wizard to set my preferences and run the bash script, it always end with the following error message:

---> Package perl-Net-SMTP-SSL.noarch 0:1.01-13.el7 will be installed
---> Package perl-XML-SAX-Base.noarch 0:1.08-7.el7 will be installed
---> Package perl-XML-SAX-Writer.noarch 0:0.53-4.el7 will be installed
--> Processing Dependency: perl(XML::NamespaceSupport) for package: perl-XML-SAX-Writer-0.53-4.el7.noarch
--> Processing Dependency: perl(XML::Filter::BufferText) for package: perl-XML-SAX-Writer-0.53-4.el7.noarch
---> Package python36-pycparser.noarch 0:2.14-2.el7 will be installed
--> Processing Dependency: python36-ply for package: python36-pycparser-2.14-2.el7.noarch
--> Running transaction check
---> Package amavis.noarch 0:2.12.0-10.el7 will be installed
--> Processing Dependency: perl(Mail::SpamAssassin) for package: amavis-2.12.0-10.el7.noarch
---> Package libtommath.x86_64 0:0.42.0-6.el7 will be installed
---> Package perl-XML-Filter-BufferText.noarch 0:1.01-17.el7 will be installed
---> Package perl-XML-NamespaceSupport.noarch 0:1.11-10.el7 will be installed
---> Package python36-ply.noarch 0:3.9-2.el7 will be installed
Removing postfix.x86_64 2:2.10.1-9.el7 - u due to obsoletes from installed exim-4.94-1.cp1194.x86_64
--> Restarting Dependency Resolution with new changes.
--> Running transaction check
---> Package amavis.noarch 0:2.12.0-10.el7 will be installed
--> Processing Dependency: perl(Mail::SpamAssassin) for package: amavis-2.12.0-10.el7.noarch
---> Package postfix.x86_64 2:2.10.1-9.el7 will be installed
--> Finished Dependency Resolution
Error: Package: amavis-2.12.0-10.el7.noarch (epel)
           Requires: perl(Mail::SpamAssassin)
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
<< ERROR >> Installation failed, please check the terminal output.
<< ERROR >> If you're not sure what the problem is, try to get help in iRedMail
<< ERROR >> forum: https://forum.iredmail.org/

What should I do to overcome this issue?