If you wish to send emails using an e-mail address with your very own domain name, make sure that the company will give you usage of their SMTP server. The latter is the software which enables emails to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outgoing emails from applications, webmail and contact web forms. Whenever a message is sent out, the SMTP server confirms with the DNS servers around the world where the e-mails for the receiving domain are handled and as soon as it gets this data, it connects to the remote POP/IMAP server to see if the recipient mail box is out there. In case it does, the SMTP server directs the message body and then the receiving server sends it to the mail box in which the recipient can open it and read it. Without an SMTP server on your server, you won't be allowed to mail out messages in any way.