Update Sendmail on centos 7.6.1810

[KAWAQ2020]

Please help to update sendmail on centos 7

I have sendmail 8.14.7-5.el7 installed from yum.
and now I am in charge to update it to sendmail 8.17.1-1.fc35
I found fedora 35 repositories(latest fedora repositories),and I try Update sendmail, but it's not work
My CentOS version is 7.6.1810

[CentOS]
/etc/yum.repos.d
･fedora.repo
･fedora-updates.repo

How should I do updating in better way?

[sml]

By rebuilding from Fedora 35 .src.rpm.

But why would you update Sendmail to the Fedora 35 version in the first place? Is the currently installed version lacking anything you need?

BTW, the latest CentOS 7 release is 7.9.2009. That is what you have to update to first and foremost. By doing this, you'll update Sendmail to 8.14.7-6 as well.

[TrevorH]

CentOS 7.6 has not been supported since the release of 7.7 in mid-2019. Your first step is to yum update to the current release, 7.9.2009 plus assorted other patches that have come out since.

and now I am in charge to update it to sendmail 8.17.1-1.fc35

This is fundamentally the wrong thing to do. You should not be running Fedora packages on CentOS. They are different operating systems and are NOT compatible.

CentOS 7 is supported until 2024 and Red Hat will patch any high severity security problems in the packages that are shipped as part of it. It should not be necessary to go out and find foreign rpms and corrupt your install.