In grails 6, emails are not deleted

[EnriqueSah]

When setting asynchronous.mail.clear.after.sent = true

The value received is a String instead of a boolean, so, when it enters this method:

private static List<Boolean> getAsynchronousMailDeletingOptionsFromValue(value) {
        switch(value){
            case 'attachments':
                return [false,true]
            case true:
                return [true,false]
            case false:
                return [false,false]
            default:
                return [false,false]
        }
    }

It goes to the default value because it is "true" instead of true.

I suggest modifying it so it is:

case true:
case "true":
...
case false:
case "false":
...