Non-profits saw an increase in inbox placement over the first half of 2013, with 90% of the emails sent by these organizations landing in subscribers' inboxes, according to a recent report released by Return Path. Social networks were not so lucky, with 25% of emails sent by social networks not reaching subscribers' inboxes. The "Inbox Placement Rate Benchmarks" report also revealed that Google's Gmail is the most challenging inbox to land in overseas, while in the United States 86% of emails that were sent to Gmail ended up in the inbox.