If you wish to send out e-mail messages through an email address with your domain, make sure that the company will provide you with usage of their SMTP server. The latter is the software system that allows emails to be sent out. 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 the DNS servers worldwide where the emails for the receiving domain name are taken care of and when it acquires this data, it connects into the remote POP/IMAP server to find out if the recipient mail box is out there. If it does, the SMTP server sends the message body while the receiving server sends it to the mail box where the recipient can open it up and see it. Without an SMTP server on your end, you will not be capable to send out messages at all.