When you send important emails, you never know if the recipient received it or they have opened it or not. Although you can add a read receipt in Outlook 2010, but the recipient can chose not to respond. EmailOracle is a Gmail plugin which does the job of tracking emails and informing you whether the recipient has open the mail. EmailOracle plugin is available for Firefox, Google Chrome, or Safari. Once installed, you need to authorize access to your account. After authorization, your account will have Tracked Emails option.
When you compose an email, you can check the boxes to track the email. You can also set the time for reminding you if the email is not tracked. From the tracked mails option, you can see the complete list of tracked emails.
EmailOracle free service provides you with 20 email trackings per month, in case you need more, you need to get a paid account.
