When you've got a hosting package and you set up an e-mail address, you may take the option to send and receive messages for granted, but in fact, that isn't always the case. Sending e-mails is not always included in the hosting plans that providers feature and an SMTP service is needed to be capable to do that. The acronym signifies Simple Mail Transfer Protocol and that is the set of scripts that permits you to send email messages. If you are using an e-mail app, it creates a connection to the SMTP server. The latter then looks up the DNS data of the domain, that is a part of the receiving address to find out which mail server deals with its e-mails. After some system information is exchanged, your SMTP server provides the message to the remote IMAP or POP server and the email is finally delivered in the corresponding mailbox. An SMTP server is needed if you work with some kind of contact form too, so if you work with a no charge hosting package, for example, it is likely that you will not have the ability to make use of such a form as many free of charge hosting companies don't allow outgoing e-mails.