If you have a cloud hosting package 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 e-mails isn't always part of the hosting packages that providers have and an SMTP service is required to be able to do that. The abbreviation signifies Simple Mail Transfer Protocol and this is the set of scripts that enables you to send out e-mails. If you use 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 email messages. After system data is swapped, your SMTP server delivers the email to the remote IMAP or POP server and then the e-mail is finally delivered in the corresponding mailbox. An SMTP server is needed if you are using some sort of contact page form too, so if you have a cost-free hosting plan, for example, it is likely that you will not have the ability to make use of this type of form as many free hosting companies don't allow outgoing e-mails.