Why is it an issue to verify sending addresses? Your setup now requires that you control the domain as well.
You don't have to pay to get whitelisted with an ISP. You have to have good IP reputation then apply.
Many ISPs are turning to returnpath to manage their white lists, and that is indeed a daunting financial outlay.
Which big ones use that as their white label?
Cox, Comcast, Roadrunner, etc. Most of the large ones besides Gmail.
Thanks - that's why I use sendgrid & mailchimp. Don't have time to care about these things.
Don't know why you're being downvoted; any business <$1M annual revenue that has to send loads of e-mail shouldn't be wasting time rolling their own solutions
We do more than that, but only send a few hundred emails per day outside of our internal google apps accounts (using sendgrid) and then blast a newsletter once a week via mailchimp.