You can try here:
https://support.apple.com/en_US/downloads
I'm still looking to find where I can download macOS 12.0.1
Only newer version and beta are available.
Wow! It's now so hard to find just an older installer.
One version back.
Apple doesn't help developers when you want to go one version back without using Time Machine.
The installer version is not enough old to be available with the link that I've provided to you.
jfdion
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The MacOS update Montery 12.2 resolve the problem with Mail on a MacBook Pro 16" 2021 Pro Max.
Hope this help.