If you wish to send out e-mails using an email address with your very own domain name, you have to make sure that the provider will provide you with access to their SMTP server. The latter is the software allowing e-mails to be transmitted. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outbound e-mails from programs, webmail and contact forms. When a message is sent, the SMTP server confirms with the DNS servers throughout the world where the e-mails for the receiving domain are managed and when it acquires this information, it will connect into the remote POP/IMAP server to check if the recipient mailbox exists. If it does, the SMTP server sends the message body and then the receiving server delivers it to the mailbox in which the recipient can open it up and read it. Without having a SMTP server on your end, you will not be allowed to mail out emails at all.