When you've got a hosting account and you create an e-mail address, you may consider the option to send and receive emails for granted, however, that isn't always the case. Sending e-mail messages isn't necessarily included in the website hosting packages that companies offer and an SMTP service is required to be capable to do that. The acronym means Simple Mail Transfer Protocol and that is the piece of software that permits you to send out e-mails. If you work with an email app, it connects to the SMTP server. The latter then queries the DNS data of the domain, which is a part of the receiving address to find out which mail server manages its email messages. After system information is swapped, your SMTP server delivers the e-mail to the remote IMAP or POP server and then the e-mail is finally delivered in the corresponding mailbox. An SMTP server is necessary if you use some sort of contact page as well, so in case you have a free hosting package, for instance, it's probable that you won't be able to make use of this type of form as most free of charge web hosting providers don't allow outgoing e-mails.