When you've got a shared web hosting plan and you create an e-mail address, you may consider the option to send and receive messages for granted, but in fact, this isn't always the case. Sending emails is not necessarily included in the web hosting plans that companies offer and an SMTP service is required to be able to do that. The acronym represents Simple Mail Transfer Protocol and that is the set of scripts that enables you to send out e-mails. If you work with an e-mail app, it creates a connection to the SMTP server. The latter then searches the DNS data of the domain name, that is a part of the receiving address to find out which mail server manages its emails. After some system information is swapped, your SMTP server delivers the e-mail to the remote IMAP or POP server and the email is finally delivered in the matching mailbox. An SMTP server is needed if you are using some sort of contact page form also, so in case you have a cost-free hosting plan, as an example, it's probable that you will not be able to use this type of form as most free website hosting providers do not allow outgoing emails.