Gmail - Schedule the sending of your emails with Boomerang
You always forget to send your important emails, whether its for a friend's birthday, documents for a client or colleague... The Boomerang for Gmail can help you out! With Boomerang, you can schedule the automatic sending your emails.
Boomerang is a browser extension available for Google Chrome, Firefox and Safari, allowing you to write your emails from your Gmail mailbox and schedule (date and time) when to send them.
Once installed the tool takes the form of a "Send Later" button, which is automatically displayed when composing an email.
The free version of Boomerang allows you to scheduled the sending of ten emails per month.