If you wish to send e-mail messages using an e-mail address with your very own domain, make sure that the company will provide you with access to their SMTP server. The latter is the software which permits e-mails to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outgoing emails from programs, webmail and contact forms. When a message is sent, the SMTP server checks with all the DNS servers globally where the emails for the receiving domain name are handled and when it obtains this info, it creates a connection into the remote POP/IMAP server to check if the recipient mail box is out there. When it does, the SMTP server transmits the e-mail body while the receiving server sends it to the mailbox where the recipient can open it up and read it. With no SMTP server on your end, you won't be capable to send messages at all.