In order for you to send out e-mails using an email address with your very own domain, you have to make sure that the provider will provide you with access to their SMTP server. The aforementioned is the software system allowing email messages to be dispatched. SMTP is an acronym for Simple Mail Transfer Protocol and it manages all outgoing email messages from programs, webmail and contact forms. Every time a message is sent out, the SMTP server confirms with the DNS servers worldwide where the e-mails for the receiving domain are managed and when it acquires this info, it creates a connection to the remote POP/IMAP server to find out if the recipient mail box is out there. If it does, the SMTP server sends the e-mail body and the receiving server delivers it to the mailbox where the recipient can open it up and see it. Without an SMTP server on your server, you won't be able to send out emails at all.