Gmail blows up e-mail marketing by caching all images on Google servers
Ever wonder why most e-mail clients hide images by default? The reason for the “display images” button is because images in an e-mail must be loaded from a third-party server. For promotional e-mails and spam, usually this server is operated by the entity that sent the e-mail. So when you load these images, you aren’t just receiving an image—you’re also sending a ton of data about yourself to the
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Google Quietly Updates Gmail to Cache Images: Impact for Email Marketers - ClickZ
