How do I remove an a closed email off the not trusted certificate list

Hey JLSelf,

Thanks for using Apple Support Communities! If you're seeing an alert about a trusted certificate that you manually installed, here's how to remove it: Trust manually installed certificate profiles in iOS and iPadOS - Apple Support

If instead you need to remove an email account from your iPhone, these steps will help: Add and remove email accounts on iPhone - Apple Support

Log out of or remove email accounts

1. Go to Settings  > Mail > Accounts.

2. Tap the email account you want to remove, then do one of the following:

• If you’re removing an iCloud email account: Tap iCloud, tap iCloud Mail, then turn off “Use on this iPhone.”

• If you’re removing another email account: Turn off Mail.

Note: To remove the email account from all apps on your iPhone, tap Delete Account.

We hope this helps.

Take care!