If you'd like to send emails using an e-mail address with your domain name, you have to make sure that the provider will give you usage of their SMTP server. The aforementioned is the software that permits e-mail messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outgoing emails from applications, webmail and contact forms. Whenever a message is sent, the SMTP server confirms with the DNS servers throughout the world where the emails for the receiving domain are managed and when it acquires this info, it connects into the remote POP/IMAP server to find out if the recipient mail box is available. If it does, the SMTP server sends the email body and the receiving server sends it to the mailbox in which the recipient can open it up and see it. With no SMTP server on your server, you won't be able to send out e-mails in any way.