Chairman and CEO Matt Blumberg just announced that Return Path is now sixteen years old! Congrats to everyone over at Return Path. That's a long time in the email game. Lots of other companies have come and gone in the email and reputation space since then and Return Path's longevity is a sign that they're doing something right.
(What else happened sixteen years ago? Back in May, 1999 I announced my anti-spam blacklist RRSS. Ah, those were the days.)
Spam filtering technology, email marketing best practices, and overall email technology sure has changed a lot in the last sixteen years! And there's no sign that things are slowing down, what with broader adoption of DMARC and the newly-announced ARC specification both going to make for an interesting 2016.