How do we send and receive email over the Internet ?

Diagram 1 shows how a typical Internet user connected to the Internet via cable modem or ADSL provider.

Diagram 2 shows how we receive email in general.

Diagram 3 shows a special case of Yahoo, Gamil and Hotmail.

Diagram 4 shows a special case for Microsoft Exchange Server and Microsoft Outlook (Large enterprise usually can afford this model)

Diagram 5 shows a special case for IBM Lotus Notes (Large enterprise can usually afford this model).

Diagram 6 shows how to do mail lists (mass email) for email marketing using your own MTA at data center.

Diagram 7 shows how to co-locate the MTA in your own house, but get a "public, static IP" address from your ISP.

How do anti-spam system identify emails as "spam".


Disclaimer