First, blogging is more like publishing a paper than writing a note. If I want to write you, I don’t need to publish it for the whole world to see. Yes, through security you can control who sees what content. However, what you are doing is using a publishing system and then hacking it into a messaging system. Possible? Yes. Ideal? No.

Second, with blogging, the intention is to leave content available on a server forever. While this might satisfy US archiving requirements I don’t think people are going to be happy about leaving their deep dark secrets (sent to one person) on a blogging server forever and hope that the security always works for time immemorial.

Third, email has many problems besides spam. Encryption, for one, is a major problem with email today. It is just too difficult for the masses to adopt it. I guess you could handle this through the security system mentioned above.

Fourth, people love the offline convenience of email composing. You could compose in an HTML editor but how many people want to do that? If you use something else, then when you connect it is not just hitting send/receive but rather you must setup everything when you are online. This moves more work from being able to be done offline to requiring it to be done online.

I do agree that we need a replacement for email. Spam, authentication, encryption/privacy, delivery notifications are all major issues needing to be solved. However, I think there is already a replacement out there. Check out http://TrulyMail.com and you will see what I mean.