If you'd like to send out email messages using an email address with your very own domain name, make sure that the company will provide you with access to their SMTP server. The latter is the software which enables emails to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outbound e-mails from applications, webmail and contact web forms. When a message is sent, the SMTP server checks with the DNS servers throughout the world where the emails for the receiving domain are taken care of and as soon as it acquires this info, it connects into the remote POP/IMAP server to check if the recipient mailbox exists. If it does, the SMTP server delivers the email body and the receiving server sends it to the mailbox in which the recipient can open it up and read it. With no SMTP server on your end, you will not be capable to mail out e-mails at all.