A good solution could be the same as physical mail too -- signatures.You sign mails you send with your signature. Anyone who knows you or has your signature on file can then make a pretty solid guess on whether or not the mail came from you. Digital signatures can provide the exact same purpose with email. If my bank digitally signed their emails; and a certificate went up to verisign or whomever, I could have as much confidence that their emails are not forged as I do that their HTTPS web site is actually theirs.
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