Better security and privacy through image proxying (opens in new tab)

I have edited that sentence to say "where the request came from" rather than "who has actually requested it".

Overall though, its still an improvement. A key in the URL does verify that the email address is deliverable, which isn't nothing, but still can't be directly correlated with an IP address or other tracking data.

Actually the reason is that we're planning to roll out an EV cert later this year, and we hated the idea that an arbitrary email can remove the green badge.

Once we decided we wanted to do this, then we looked around to see what other places were doing. That's when we noticed Gmail, but it was actually Github's Camo proxy that we thought of first (and ended up cloning).