If you'd like to send e-mails using an e-mail address with your very own domain name, you have to make sure that the company will give you access to their SMTP server. The latter is the software allowing email messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outbound e-mails from apps, webmail and contact web forms. When a message is sent, the SMTP server checks with all the DNS servers worldwide where the emails for the receiving domain are taken care of and when it acquires this info, it will connect to the remote POP/IMAP server to find out if the recipient mailbox is out there. When it does, the SMTP server transmits the message body and then the receiving server sends it to the mail box in which the recipient can open it up and read it. Without an SMTP server on your server, you will not be capable to send out e-mails in any way.