If you want to send emails using an email address with your own domain name, you have to make sure that the company will give you access to their SMTP server. The aforementioned is the software system which permits e-mail messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outgoing emails from programs, webmail and contact forms. Whenever 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 data, it creates a connection into the remote POP/IMAP server to find out if the recipient mailbox is out there. If it does, the SMTP server sends the email body and then the receiving server delivers it to the mailbox where the recipient can open it up and see it. Without having a SMTP server on your end, you won't be able to send out emails in any way.