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> what time

Not necessarily. Does Google cache the image when receiving the email, or when you view it?

Google only fetches the image when you first view it. At least it did when I tested it when they first started doing it.

That still seems to be the behaviour, so it still works for open tracking just not the additional meta data. Fantastic tool you've created by the way!

I haven't tested it yet, but it seems you can setup your tracking image to return a "Cache-Control: no-cache, max-age=0" header and it will always be reloaded when the email is opened.

http://blog.movableink.com/real-time-content-and-re-open-tra...

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