In case you have a shared hosting plan and you create an e-mail address, you may consider the option to send and receive messages for granted, but in fact, that isn't always the case. Sending e-mail messages is not always part of the web hosting plans that companies have and an SMTP service is required to be capable to do that. The abbreviation stands for Simple Mail Transfer Protocol and this is the software application that permits you to send out e-mails. If you work with an email program, it connects to the SMTP server. The latter then searches the DNS data of the domain, that is a part of the receiving address to find out which email server handles its e-mails. After system data is interchanged, your SMTP server delivers the message to the remote IMAP or POP server and then the e-mail is finally delivered in the matching mailbox. An SMTP server is necessary if you are using some sort of contact page form too, so if you work with a free of charge hosting plan, as an example, it's probable that you will not have the ability to use this type of form as most free of charge web hosting service providers do not allow outgoing email messages.