Email marketing is the direct way of marketing a commercial message to a group of people using the email service. Firms in United States mostly depend on the email marketing and the expenditure of email marketing in 2011 was $1.51 billion and it is estimated that expenditure amount may reach to $2.468 billion by 2016.
The most interesting fact is that 25.4% of emails sent on Tuesday of every week are opened on the same day. It is projected that 75% of emails delivered will be opened between 6 Am to 6 Pm. Worst days for email marketing is Saturday and Sunday, only 1% mails are opened on these both days. Email marketing is done in three ways that include email newsletters, transactional email and direct emails.