If you wish to send email messages through an e-mail address with your domain, make sure that the company will give you usage of their SMTP server. The latter is the software which enables e-mail messages to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound emails from programs, webmail and contact forms. Whenever a message is sent out, the SMTP server checks with the DNS servers around the world where the e-mails for the receiving domain name are managed and as soon as it gets this info, it creates a connection to the remote POP/IMAP server to find out if the recipient mailbox is out there. If it does, the SMTP server sends the email body while the receiving server sends it to the mailbox in which the recipient can open it and see it. Without an SMTP server on your server, you won't be capable to send e-mails at all.