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I haven't used them before but my assumption would be that they charge you based on the number of emails sent rather the size of your contact list.

quite the contrary, pretty much all of the email newsletter companies charge based on the number of subscribers.

a few do have the pay as you go plans that are based on # of emails sent...but they are all secondary products for them

seems pretty stupid. I can understand charging on a per email basis...but storing lists of contacts won't cost them anything.