The findings of the survey of more than 400 US-based white collar workers, 18 and older, challenge conventional views of email as a tired, over-saturated medium for engaging consumers.
The survey by Adobe Campaign found that on average, survey respondents reported using email six hours a day, or more than 30 hours a week.
Nine of 10 respondents said they check personal email at work and work email from home. More than one third reported having multiple personal accounts.
Americans most commonly check their email while watching TV (70 per cent), from bed (52 per cent), on vacation (50 per cent), while on the phone (43 per cent), from the bathroom (42 per cent) and even - most dangerously - while driving (18 per cent).
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Millennials are more mobile and more frequent users of email than any other age group. Millennials are more likely to check work email outside of normal work hours and one third are comfortable using emojis to communicate with a direct manager or senior executive.
The survey also found that though Americans are using email more than ever, many also experience email fatigue.
Twenty-four per cent of respondents believe they check email "way too much." Thirty-four per cent reported having had to create a new email address due to an overwhelming amount of spam.
Four out of ten reported going on self-imposed 'email detox' programmes, avoiding their inboxes for an average of five days.