Gmail- Shows quick link to track packages when there is a tracking number in the email.
Gmail - When receiving an email from PayPal, there is a small key in Gmail to show that it is from an authorized sender.
Gmail - When you send an email that contains a Google Drive link, it warns you if the file isn’t shared with the recipients.
Gmail - Incompatible versions of Internet Explorer show a damaged envelope as the favicon.
/via Eric Hansz
Gmail - The “Attach files” icon changes after the first attachment was uploaded.
Gmail - Selecting an email in Gmail and then shift clicking on an email below it will also selects all the email between them.
/via Guy Malachi
Gmail - Typing ? in Gmail (when not in a input field) gives you a cheat sheet of all available key commands.
Gmail - While in the inbox, the Compose button is red. Then when composing an email, the Sendbutton is red instead.
/via Joe Sparano