OpenInbox

OpenInbox.com is another privacy focused service like Proton and Tutanota.

Privacy concerned users are always looking for an alternative to big tech "free" services which scan your data and build profiles on you.

OpenInbox is a U.S. based secure, encrypted, private, email subscription service built on open-source solutions. You can use our webmail portal or your own favorite IMAP/POP3 client.

OpenInbox does not share user data, monetize users, get funding from advertisers, use tracking, send data to analytics, or require a phone number to signup.

OpenInbox has two main focuses.

• Privacy. Encryption prevents any man-in-the-middle from snooping on your email. PGP keys are supported making sure only you and the person who wrote the email can read it. OpenInbox has it's own dedicated servers and doesn't use any google or amazon services meaning no one is collecting data or habits from your email usage.
• Power Users. OpenInbox has control panels for power users to set mail policies on what is considered spam including exempt/ban list. Stop being a victim to free service's black-box spam filters that leave you guessing why something went to spam or didn't get blocked. You get access to mail logs so you can see what and why something happened.

If you have ever wanted 100% privacy and the control of hosting your own mail server but don't have the resources or time to learn, and want to avoid the headaches involved then OpenInbox is the solution for you.

https://www.openinbox.com

And isn't the Oracle Linux stream free to get updates from?

Yes its completely free. You can yum/dnf your updates just like CentOS. It is CentOS (RHEL). Their business model is hoping you will pay them for support if you need help. They also offer a paid feature that lets you update the kernel without rebooting, if it's important for you to never have to reboot and have down time.

But if you manage linux yourself, then nothing to worry about.

Set all of them up as forwarders to hostboards.com, have your cake and eat it too.

I found Oracle Linux to be a better replacement for CentOS.
https://yum.oracle.com/oracle-linux-downloads.html

Oracle linux is pure byte-for-byte Redhat RHEL with only difference being oracle maintains their own repos for yum/dnf packages.