Upgrade Postfix to 3.0 version

Hello,
How to Upgrade Postfix 2.10.1-6.el7.centos.x86_64 to 3.0 version?

Thanks!

==== Information ====
- iRedMail version: 0.9.0
- Store mail accounts in which backend: MariaDB 10:
- Linux/BSD distribution name and version: CentOS 7
- Related log if you're reporting an issue:
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