“Gmail supports a plethora of search operators to help you instantly find that elusive email message buried in your mailbox [this article provides a very useful taxonomy to assist you in creating your search]. You have size search – like larger_than:5mb – to find the big messages in your account. File search – like has:attachment filename:doc – will locate email messages that contain file attachments of specific types. This graphic illustrates all the known search operators that work both on Gmail and Google Inbox…”