Hi,
I just noticed that on servers that do not have Engintron, going to http://webmail.domain.tld on cPanel auto-redirects to https://webmail.domain.tld when the appropriate settings are configured in WHM--> Tweak Settings:

Choose the closest matched domain for which that the system has a valid certificate when redirecting from non-SSL to SSL URLs. Formerly known as “Always redirect to SSL/TLS” [ENABLED]

Require SSL for cPanel Services --> ON

On this cPanel without Engintron, going to http://webmail.domain.tld , it automatically redirects to https://webmail.domain.tld which has a valid SSL installed.

On the same cPanel with Engintrol installed, going to http://webmail.domain.tld does not redirect to https://.

I believe this is a bug, and it will affect PCI compliance on future PCI compliance scans.