Email marketing is directly marketing a commercial message to a group of people using email. In its broadest sense, every email sent to a potential or current customer could be considered email marketing. It usually involves using email to send ads, request business, or solicit sales or donations, and is meant to build loyalty, trust, or brand awareness. Email marketing can be done to either sold lists or a current customer database. Broadly, the term is usually used to refer to sending email messages with the purpose of enhancing the relationship of a merchant with its current or previous customers, to encourage customer loyalty and repeat business, acquiring new customers or convincing current customers to purchase something immediately, and adding advertisements to email messages sent by other companies to their customers.
Transactional emails are usually triggered based on a customer’s action with a company. To be qualified as transactional or relationship messages, these communications' primary purpose must be "to facilitate, complete, or confirm a commercial transactions that the 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 its high open rates (51.3% compared to 36.6% for email newsletters), transactional emails are an opportunity to engage customers: 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 email or interruption based marketing involves sending an email solely to communicate a promotional message (for example, an announcement of a special offer or a catalogue of products). Companies usually collect a list of customer or prospect email addresses to send direct promotional messages to, or they can also rent a list of email addresses from service companies, but safe mail marketing is also used.