It took a lot of effort for e-marketers and operators to actually find the way to go through GMail, and end up as a mail inside the Inbox, and not into Junk folders. GMail was actually a beta thing, it wasnt until 2009 that Google launched its alpha version, but for the pain of many mailers, newsletters, e-zines, etc... to comply with GMails junk filters was hell of a challenge since its early stages (back in 2004). Worst of all, those great filters were one of their great features, everyone wanted a GMail account, but as most of Google important apps, there was an "invitation" stage, where just few users could test and use it. There are now 176 million monthly users/accounts, which means... its a BIG potential client cluster, still, its hard to break junk filter has been also evolving, learning, catching. If any follows the "anti spam" rules, their mail will pretty much have a 25% chance to go all the way down into the Inbox. So, e-marketers, bulk mailers, and frie...