Delete a Mail account in iPhone

Hi JaumeBS,

You can find steps for removing an email account here:

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.

Add and remove email accounts on iPhone - Apple Support

We hope that helps.

Have a great day!