I have 350-400k emails/cell #s from running coreg. They are in a couple different 'niches.' I have never mailed, and been sitting on this data for months. Would it take a lot to utilize these? Thanks in advance for helping this mailing noob!
what type of vertical/niche? mailing that size will take some work considering you can't use a consumer ESP. but depending on vertical/niche it could be worthwhile. double opt-in?