If you need to send email messages through an e-mail address with your own domain, you have to make sure that the company will give you usage of their SMTP server. The aforementioned is the software which permits e-mails to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outgoing e-mails from applications, webmail and contact web forms. Whenever a message is sent, the SMTP server checks with all of the DNS servers around the world where the emails for the receiving domain are managed and once it gets this information, it creates a connection into the remote POP/IMAP server to check if the recipient mailbox is out there. If it does, the SMTP server sends the e-mail body while the receiving server sends it to the mail box in which the recipient can open it up and read it. Without an SMTP server on your server, you will not be able to mail out e-mails in any way.