With SPF, the path for person-to-person mail would need to be
guaranteed. Mail
You're talking about a complete rewrite of smtp protocol.
from joe.com will have to come from a servers that is allowed to
send mail to
"the world" from joe.com. How Joe gets mail to one of those
servers, while
travelling or not, is irrelevant to the final recipient.
Or, of course, the DNS admin for joe.com can say that mail from
joe.com can
come from anywhere (or just not publish an SPF record). Which
Even if I publish an spf record saying that spf(_at_)nedharvey(_dot_)com sends
mail
from smtp.rcn.com or smtp.aol.com or whatever, that's already allowing 2
million people forge my address and be verified "authentic." If we make it
even broader, it's useless.
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