But it *could* be. You can set the following SPF record for workdomain.com (if Earthlink has their own SPF set up correctly):
v=spf1 [...] include:earthlink.net -all
or (if Earthlink uses their incoming MXes as outgoing MXes as well):
v=spf1 [...] mx:earthlink.net -all
or even (otherwise):
v=spf1 [...] a:smtp.earthlink.net -all
So my employer has to determine which networks I'm allowed to roam onto?!
So when I travel on business, I should call the hotel a day or two ahead of time to ask who their service provider is and what their SMTP servers are, so I can ask the work NOC to add it as a valid sender?!
What planet are we talking about?
Yahoo's scheme has the advantage that the owner of workdomain.com doesn't have to open his domain to forgery from other domains (like in the example above). But as soon as a user @workdomain.com is forced to send through a 3rd party SMTP relay (like in the example above), either the user or that 3rd party would need access to the workdomain.com private key to properly sign the sent messages.
Of course. But it makes lots more sense for employees of workdomain.com to have access to its private key than it does for servers of randomroamprovider.net to.
So essentially, the difference in this regard between SPF and the Yahoo scheme is that with SPF, the 3rd party must be trusted, while with the Yahoo scheme, the 3rd party OR the user @workdomain.com must be trusted. I.e., with SPF, trust cannot be delegated to the user.
No, but you seem to trivialize the amount of work and the impractical and unreasonable policy involved in that difference.
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