Eva Chen used to be a strict believer in Inbox Zero.

As Instagram's director of fashion partnerships, the 40-year-old former magazine editor gets hundreds of messages a day about everything from work approvals to scheduling meetings to event invitations. To tame her inbox and handle what she admits is a stressful subject for her, Chen told the podcast "The Cut on Tuesdays" about the time-saving email hack she developed during her time at Teen Vogue.