In case you have a shared hosting plan and you set up an e-mail address, you might consider the option to send out and receive emails for granted, however, that isn't always the case. Sending e-mails is not necessarily part of the website hosting plans that service providers feature and an SMTP service is required 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 out emails. If you are using an email program, it creates a connection to the SMTP server. The latter then queries the DNS records of the domain, which is a part of the receiving address to find out what mail server handles its emails. After some system data is interchanged, your SMTP server delivers the email to the remote IMAP or POP server and then the e-mail is finally delivered in the matching mailbox. An SMTP server is required if you work with some sort of contact page too, so if you work with a no charge hosting plan, for instance, it is very likely that you will not have the ability to use such a form since many free web hosting providers do not allow outgoing e-mails.