If you want to send e-mails using an email address with your own domain, you have to make sure that the provider will give you usage of their SMTP server. The latter is the software which permits email messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outgoing email messages from programs, webmail and contact forms. When a message is sent, the SMTP server checks with the DNS servers around the world where the emails for the receiving domain are handled and as soon as it obtains this info, it connects into the remote POP/IMAP server to see if the recipient mail box is available. When it does, the SMTP server delivers the message body and then the receiving server delivers it to the mail box in which the recipient can open it up and read it. Without an SMTP server on your end, you will not be capable to send out emails at all.