If you would like to send e-mail messages through an email address with your very own domain name, you have to make sure that the company will give you access to their SMTP server. The latter is the software that enables email messages to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outbound emails from applications, webmail and contact forms. Every time a message is sent out, the SMTP server checks with all of the DNS servers around the world where the e-mails for the receiving domain are taken care of and once it gets this information, it creates a connection into the remote POP/IMAP server to check if the recipient mail box is out there. If it does, the SMTP server delivers the e-mail body and the receiving server delivers it to the mailbox in which the recipient can open it up and see it. With no SMTP server on your end, you will not be capable to send emails in any way.