Welcome emails attract customers at the very beginning and first impressions benefit in retaining customers. E-mail is a computer-based program that allows users to communicate with one another through the exchange of messages. The electronic counterpart of a letter is e-mail, which offers benefits in flexibility and immediacy. An email is sent to the intended recipient’s mailbox nearly instantly, typically in the multiple-second to the sub-minute range, unlike a letter, which might take one day to a few weeks to arrive. This holds true whether the emails are sent between friends who are located on different sides of the world or between coworkers on the same floor of a company. This PPT offers a thorough, intermediate-level overview of email, including its primary purposes, historical and modern architectural frameworks, important standards, underpinning infrastructure, and modern applications.