Fifty per cent of 25 to 34-year-olds told ICM researchers they would not be able to carry on without e-mail. Forty one per cent of teenagers said they relied on e-mail, while 44% of 35 to 44-year-olds said e-mail was vital.
The South East was the most e-mail-reliant region, with 43% of people telling the poll for software firm Nasstar they relied on it. Wales was the lowest, with only 34% saying e-mail was vital to them.
More women than men - 41% compared with 38% - said they would be lost without access to their inbox.
Read the story in full - Half of Britons 'e-mail addicts'