If you'd like to send email messages through an email address with your personal domain name, you have to make sure that the company will provide you with usage of their SMTP server. The aforementioned is the software which permits emails to be sent out. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outbound email messages from applications, webmail and contact forms. When a message is sent out, the SMTP server confirms with all the DNS servers worldwide where the emails for the receiving domain name are taken care of and once it acquires this info, it creates a connection to the remote POP/IMAP server to see if the recipient mail box is out there. If it does, the SMTP server sends the message body and the receiving server delivers it to the mail box in which the recipient can open it up and see it. Without an SMTP server on your end, you will not be capable to send out emails in any way.