Thanks for the article, it was also interesting and inspiring to see your other ventures in diverse fields. Would like to connect 1:1 in the near future. Meanwhile, even I had done a similar comparison as I myself handle email marketing for my organization. Do check it out as well as for the readers of the blog since it covers 2 additional players.
According to recent research from Radicati Group, worldwide email volume will reach 207 billion messages this year—more than half of those for business. The typical business user receives well over 100 emails each day. Email marketers are challenged not only to make their messages stand out in that deluge, but also to provide relevant, actionable information to targeted recipients.