Some ISPs (Google, Yahoo, etc.) will sometimes obscure Analytics information, eliminating the ability for senders to collect user-level data. Image proxies are the image caches used by some ISPs that prevent 250ok from mining data past the initial open. In these instances the provider will store a copy of the tracking pixel on their server – later views of the email will load your tracking pixel from their server rather than the original server.
Open your 250ok Settings Menu and select “Contact Support” under Help Center or contact 250ok Support if you have any questions about 250ok Analytics.