3 ms·

I may be wrong but I believe google cached it after you open the email first. So your IP is hidden and you can't tell how many times someone has opened an email

I may be wrong but I believe google cached it after you open the email first. So your IP is hidden and you can't tell how many times someone has opened an email, but you know the timestamp of the first time they do.

jalk 7y ago
The Gmail image-proxy honors the regular http cache headers, so marketing mails get their open rates ‘correct’ but cannot see cookies/ip addresse