4 ms·

I believe gmail downloads and caches images when it receives the email now.

• Houshalter 11y ago
  Which is even better. You can change the image right after sending it, so anyone they send it to is guaranteed to get a different image.
  • breakingcups 11y ago
    That brings up an interesting question. Does GMail cache per-user or per-url? I would suspect the latter.
    • Houshalter 11y ago
      Would still work if they sent to a different email client.