New York--Expenditures on e-mail marketing will rise 417% between 1999 and 2003, according to a report released Friday by eMail Marketing Report, New York. Expenditures on e-mail marketing reached $898 million last year, and will reach $4.6 billion by 2003, the report said. The study also projected e-mail volume will increase 52.3% to 61.1 billion by the end of the year, and reach 240 billion by 2003. Average cost per e-mail sent is 1 cent to 25 cents, vs. $1 to $2 for a postal direct mail. And 61% of midsize to large companies have an e-mail marketing strategy.