If you wish to send out email messages through an email address with your very own domain, you have to make sure that the company will give you usage of their SMTP server. The aforementioned is the software that allows e-mail messages to be sent out. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outgoing e-mails from applications, webmail and contact web forms. Every time a message is sent out, the SMTP server checks with all of the DNS servers around the world where the emails for the receiving domain name are managed and once it obtains this data, it will connect to the remote POP/IMAP server to check if the recipient mail box is out there. If it does, the SMTP server directs the e-mail body while 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 server, you won't be able to mail out messages in any way.