I have been very fortunate in my bulk emailing campaigns. The company I use is not widely known, but they are excellent.
I just send 1 of the support staff my leads, and he scrubs the leads for any complainers in a huge database list, and then
sends those leads into the software. I just pick my campaign in which to load those leads, and I let it run for hours.
They only allow to send out 5500 leads a day...and it sends the emails at 15 at a time, wait 1 minute and do it again.
They have their own hosting company is help majorly in ISP complaints. You get to send out 100,000 emails a month,
and it comes with a prospecting system including for the leads that fill in the capture page form, and calling the leads that like what your offering.
They have training everyday, Monday through Friday, and are extremely helpful!
The price is 49.95 a month, ($25 for Software + $24.95 for Bulk Hosting)
Let me know, or PM if this is something your interested in.