Hi. I'm not interested in legal aspect, just technical. I know it's not right. But there are still governments which practice censorship. I'm not asking about spam filters. Those can be applied by mail service providers, which is different from ISP. Say my mail SP is Yahoo Mail, my ISP is Comcast for example. Comcast is not controlling Yahoo severs. But can control traffic from Yahoo server to me. Right? The situation: ISP blocked a website. Now most likely it will try to filter subscribed distribution mail from this site. Can an ISP filter my emails using information in the headers? The e-mail which I access through browser (not an e-mail client) If yes, Can this be avoided? Apparently I'll see the subject line, but will I'll be able to receive the body of the mail? The text? What if there is no text just attachment, say zip file?