If you want to send out e-mail messages using an email address with your very own domain, you have to make sure that the provider will give you usage of their SMTP server. The latter is the software that permits e-mail messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it handles all outgoing emails from applications, webmail and contact forms. When a message is sent, the SMTP server confirms with all the DNS servers around the world where the e-mails for the receiving domain are handled and when it obtains this information, it will connect to the remote POP/IMAP server to check if the recipient mailbox is out there. If it does, the SMTP server sends the message body and then the receiving server sends it to the mailbox in which the recipient can open it up and read it. With no SMTP server on your server, you won't be allowed to send out emails in any way.