Shares of Pitney Bowes (NYSE: PBI) stock closed down 10.3% Wednesday after the postal services company reported first-quarter 2018 earnings.Pitney Bowes reported earning $0.28 per share on a GAAP (generally accepted accounting principles) basis in Q1, and $0.30 adjusted for one-time items, roughly in line with the $0.29 that Wall Street analysts had predicted it would earn.