EmailTrack allows you to schedule emails to be sent  at a later date. Write a message now, send it whenever you want, even if you're not online. Track messages to make sure you hear back.

Track when your e-mails are being opened & whether the recipient responded to your e-mail. Other cool features include choosing exactly when you want an email sent, an interface which is directly integrated into Gmail

If you do not get a response from your e-mail, our extension can give you a reminder so you can follow up without forgetting. Archive e-mails which are not important and remove the clutter from your inbox. It is free to use EmailTrack, up to a limited number of messages per month.