u.s. secretary state rex tillerson use alias email address chief executive exxon mobil corp entirely proper attorneys represent company say letter new york court thursday new york attorney general eric schneiderman investigate whether exxon mislead shareholders public climate change write judge monday accuse exxon previously disclose alias tillerson communications tillerson use alias email address oil company send receive information relate climate change matter `` alias email address allow limit group senior executives send time-sensitive message mr. tillerson receive priority normal daily traffic cross desk busy ceo purpose efficiency secrecy `` attorneys law firm paul weiss rifkind wharton garrison llp say bit.ly/2ntj6mk tillerson set alias email address purpose secrecy email account would avoid reference tillerson intend recipient attorneys say obtain publicity information appear real goal new york attorney general march 13 letter attorneys say new york attorney general march 13 letter ask judge order exxon explain whether document alias email 34 additional account assign exxon executives board members preserve exxon provide 2.5 million page document response subpoena schneiderman office document include 160 email exxon management 16 months receive subpoena exxon admit may preserve produce email former ceo use alias email account look forward address issue letter raise court amy spitalnick press secretary office new york attorney general say email tillerson 's use email alias exxon 'entirely proper exxon attorneys