As for your vanity domain, you should be in control of the DNS entries and you would add your ISP's mail server.
This would only work if I know what ISP I am sending from. That's why I used the hotel room example.
For your Columbia.edu address, you would probably need to find a way to deliver that from/through a permitted sender. That would probably require SMTP after POP authentication, or VPN into a trusted network.
It would require smtp auth, which we implement, and also would require an ISP that lets me send to port 25 outside the ISP. Yes, smtp auth could be available at another port, but try and explain to users how to set a port using the email clients now on the market.
SFP depends partly on email client design. I find configuring clients now much harder and more obscure than it needs to be. True, if big systems require SFP, things start to happen.
Joseph Brennan Columbia University in the City of New York Academic Technologies Group [EMAIL PROTECTED]
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