If you need to send out e-mails using an e-mail address with your domain name, make sure that the company will give you usage of their SMTP server. The latter is the software system allowing e-mails to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it deals with all outgoing e-mails from applications, webmail and contact web forms. Whenever a message is sent, the SMTP server checks with all of the DNS servers around the world where the emails for the receiving domain name are taken care of and as soon as it gets this information, it connects into the remote POP/IMAP server to find out if the recipient mail box exists. In case it does, the SMTP server directs the email body while the receiving server sends it to the mail box where the recipient can open it and see it. Without having a SMTP server on your server, you won't be capable to send out e-mails in any way.