Rocket.Chat/server/startup/migrations/v023.js

RocketChat.Migrations.add({
	version: 23,
	up() {
		RocketChat.models.Settings.remove({
			_id: 'Accounts_denyUnverifiedEmails'
		});

		return console.log('Deleting not used setting Accounts_denyUnverifiedEmails');
	}
});