Fundamental difference between HTTP is unlike web server, agent need own server (usually shared). The three major component of email is like theseUser agent (mail reader)Mail serverSMTPEmail NotionEmail ProtocolMail server Email UsagesNews LetterEmail ToolEmail TemplateEmail SolutionEmail FrameworkSpam mailDynamic Email Email is not IDEmail addresses are not primary user identities | nicole@webhttps://ntietz.com/blog/email-address-not-identifier/