recipient has previously agreed to enter into with the sender" along with a few other narrow definitions of transactional messaging. Triggered transactional messages include dropped basket messages, password reset emails, purchase or order confirmation emails, order status emails, reorder emails, and email receipts. The primary purpose of a transactional email is to convey information regarding the action that triggered it. But, due to their high open rates (51.3% compared to 36.6% for email newsletters), transactional emails are an opportunity to introduce or extend the email relationship with customers or subscribers; to anticipate and answer questions; or to cross-sell or up-sell products or services. Many email newsletter software vendors offer transactional email support, which gives companies the ability to include promotional messages within the body of transactional emails. There are also software vendors that offer specialized transactional email marketing services, which include providing targeted and personalized transactional email messages and running specific marketing campaigns (such as customer referral programs). Direct emails Direct email involves sending an email solely to communicate a promotional message (for example, a special offer or a product catalog). Companies usually collect a list of customer or prospect email addresses to send direct promotional messages to, or they rent a list of email addresses from service companies. Comparison to traditional mail There are both advantages and disadvantages to using email marketing in comparison to traditional advertising mail. Advantages Email marketing is popular with companies for several reasons: Email marketing is significantly cheaper and faster than traditional mail, mainly because with email, most of the cost falls on the recipient. Businesses and organizations who send a high volume of emails can use an ESP (email service provider) to gather information about the behavior of the recipients. The insights provided by consumer response to email marketing help businesses and organizations understand and make use of consumer behavior. Almost half of American Internet users check or send email on a typical day, with emails delivered between 1 am and 5 am local time outperforming those sent at other times in open and click rates. Disadvantages As of mid-2016 email deliverability is still an issue for legitimate marketers. According to the report, legitimate email servers averaged a delivery rate of 73% in the U.S.; six percent were filtered as spam, and 22% were missing. This lags behind other countries: Australia delivers at 90%, Canada at 89%, Britain at 88%, France at 84%,