If you'd like to send out e-mail messages through an email address with your own domain, you have to make sure that the provider will provide you with access to their SMTP server. The aforementioned is the software that allows e-mail messages to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outgoing emails from programs, webmail and contact forms. Whenever a message is sent, the SMTP server checks with all the DNS servers throughout the world where the e-mails for the receiving domain are taken care of and when it acquires this data, it will connect to the remote POP/IMAP server to see if the recipient mail box is available. In case it does, the SMTP server sends the e-mail body while the receiving server delivers it to the mail box where the recipient can open it and read it. Without an SMTP server on your server, you won't be capable to send out e-mails at all.