We are in the process of simplifying email account setup at Fused!

From now on, you can use the following settings:

You can simplify that even more by using mail.fused.com for everything, but that can make troubleshooting a little more difficult in the future.

We encourage you to use the new simplified server names, but your existing settings (like s#.fused.com) will continue to work. However, if you are using mail.[yourdomain.com] you will almost certainly get Certificate Mismatch warnings. This is expected; either reconfigure mail client with the simplified server names, or accept the certificate, ensuring it's been issued by "Sectigo RSA Domain Validation Secure Server CA" and containing "fused.com" in its subject name.