In case you have a web hosting account and you set up an e-mail address, you may consider the option to send out and receive messages for granted, but in fact, this is not always the case. Sending emails is not always included in the website hosting packages that service providers have and an SMTP service is needed to be capable to do that. The acronym means Simple Mail Transfer Protocol and this is the software application that permits you to send out e-mail messages. If you work with an email app, it creates a connection to the SMTP server. The latter then requests the DNS data of the domain, which is a part of the receiving address to find out which email server handles its emails. After some system data is interchanged, your SMTP server delivers the e-mail to the remote IMAP or POP server and then the e-mail is finally delivered in the related mailbox. An SMTP server is required if you use some kind of contact page form too, so in case you have a free of charge hosting package, as an example, it is very likely that you will not be able to make use of such a form as many cost-free web hosting companies do not allow outgoing emails.