Your message could not be delivered
At 5.5 billion light-years distance, this email with attached circularly polarized lulz cat video, was sent 1 beelion years before the formation of our planet.
I can now reveal its decoded text contents. It's a chain email. Unless each recipient forwards it to 20 other civilizations by midnight Saturday, they are doomed. How the senders knew we'd be here to decode this message now may never be known, because the Chronicles end with
<Winnt_root>\System32\Hal.dll missing or corrupt:
Please re-install a copy of the above file.
I hope the boffins at Parkes know what to do next.