The benefit is skewed toward ISP's only in the sense that we are
affected the most by the consequence of not doing something. Even
corporate users could derive some benefit from spf. Just not of the
same magnatude as ISP's.
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I agree. I manage a small network of approx 50 users and due to some of
the ways the systems were set up and certain retention policies, my mail
server is constantly running out of storage space for email. There is a
cost to increase this space to hold more mail. It's not a function of
drive space either. I inherited Exchange and M$ would want a very large
sum to allow me to go past the current limitations. I don't have some
of the traffic that most of the larger entities on this list do, but
using the current system of blocking and filtering and all that we have
in place, we reject 14-15k per week. That's a good amount of email for
a company our size with the amount of users that we have less than 3500
legitimate messages a week.
I don't face any pipe saturation costs, but I would have more storage
costs and face time costs.
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