Millennials check e-mail more frequently than any other age group, the study found. And more than any other age group, Millennials expect their use of e-mail to increase over the next two years. Millennials said they were more likely to open their work missives (82 percent) than personal e-mails (60 percent). Of the e-mails opened, Millennials read 83 percent of work e-mails and 64 percent of personal e-mails. Only 35 percent of survey respondents said they open their work e-mails on their smartphones.

The survey also found that people spend a total of 5.4 hours daily during the workweek on both personal and work e-mail, even while on vacation.

About 46 percent of workers who took vacations in August said they checked e-mail while on vacation; 32 percent said they occasionally checked it, 24 percent said they rarely did, 23 percent say they never did, 17 percent said they frequently did and 4 percent said they constantly did.

According to the survey, people would rather e-mail others than meet face to face or talk on the phone, with 52 percent of respondents saying their company's main communication tool was e-mail, followed by in-person meetings (20 percent), the telephone (13 percent), instant messaging (9 percent),videoconferencing (4 percent) and enterprise social networks (2 percent).

https://www.slideshare.net/adobe/adobe-consumer-email-survey-report-2017