As more time goes by, Google and Yahoo will be more firm in actually rejecting mail. You’ll want to make sure you are watching ALL the important performance signals impacting your deliverability, beyond opens and clicks.
SocketLabs Spotlight reporting gives you a birds-eye look at all your activity, including campaign-level and recipient-level data, so you can keep tabs on your performance easily.
When your business depends on reliably reaching your customers via email, you need an ESP who helps you deliver more mail easily, without the complexity and stress of having to spend hours analyzing performance.