Postpic.net site does not require registration in order to upload images, so it doesn't record any email addresses.
We do not collect any personally identifiable data on people who view images. Hovewer, when visitor uploads image to postpic.net server information about visitor is recorded so in case of abuse of terms of service our staff can easily identify and block offending user. Information about uploader is available only to staff members that do moderation of images, that information will not be displayed anywhere in public or given to anyone.