Today I inadvertently clicked on an icon when reading an open email. When your in an open email at the top right corner there are several icons in a row. 'Folder', 'Tag', 'Trash', 'Spam', and then the icon to the right of the spam icon - I don't know what that is, or what it does? I clicked on it by accident and I cannot find the email that was open when I clicked on it. 

Thanks.

Darren