If you wish to send out e-mail messages through an e-mail address with your domain name, you have to make sure that the company will provide you with access to their SMTP server. The latter is the software system that allows e-mail messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outbound email messages from programs, webmail and contact web forms. Every time a message is sent, the SMTP server confirms with all of the DNS servers globally where the emails for the receiving domain name are taken care of and once it acquires this data, it creates a connection into the remote POP/IMAP server to find out if the recipient mailbox exists. When it does, the SMTP server directs the email body and then the receiving server sends it to the mailbox where the recipient can open it and see it. With no SMTP server on your server, you won't be allowed to mail out e-mails at all.