Yes, that's Billion with the B and 9 ZEROS!
I've managed 100s of email lists, which have included clients with more than 25,000,000 subscribers. I've designed over 1,000 email campaigns for NASCAR Member Club, RadioShack, BMO, Benjamin Moore, Good Housekeeping, MADD and many others. My efforts has resulted in a total of 13,627,546 leads generated for clients of Advanstar Communications, Bonnier Corporation, Conde Nast, Hanley Wood, Hearst, Meredith, PennWell, Penton, Rodale, Time Inc, UBM and 41 other media companies.