Filter Suggestion for MailTracker/AnswerBook

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There is a new-ish iPhone app called MailTracker that embeds a tracking image in emails sent by app users. The image is not used for advertising metrics, but rather so the app user knows whether the email recipient has opened the email. The app also provides the timestamp and IP geolocation of the recipient.

Here is their website: http://mailtrackerapp.com/
This is an article about the app: http://techcrunch.com/2014/03/28/mail...
And here is a sample link to a tracker created by the app: http://ping.answerbook.com/r/a62434a3...