In order for you to send out e-mail messages using an email address with your very own domain, you have to make sure that the provider will provide you with usage of their SMTP server. The aforementioned is the software system allowing e-mail messages to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outgoing emails from applications, webmail and contact forms. When a message is sent, the SMTP server checks with all of the DNS servers worldwide where the e-mails for the receiving domain name are handled and when it acquires this info, it connects into the remote POP/IMAP server to find out if the recipient mailbox is out there. When it does, the SMTP server sends the email body while the receiving server delivers it to the mail box in which the recipient can open it and see it. Without an SMTP server on your server, you won't be allowed to send emails at all.