If you'd like to send out e-mail messages through an email address with your very own domain name, make sure that the company will give you usage of their SMTP server. The latter is the software enabling email messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outbound email messages from apps, webmail and contact forms. When a message is sent, the SMTP server checks with all of the DNS servers globally where the emails for the receiving domain name are managed and once it acquires this info, it creates a connection to the remote POP/IMAP server to find out if the recipient mailbox is available. In case it does, the SMTP server directs the message body while the receiving server delivers it to the mail box where the recipient can open it up and read it. Without having a SMTP server on your end, you won't be capable to send out emails in any way.