If you wish to send out e-mails using an e-mail address with your domain name, make sure that the company will provide you with usage of their SMTP server. The latter is the software that permits emails to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outgoing emails from applications, webmail and contact forms. Whenever a message is sent, the SMTP server checks with all the DNS servers throughout the world where the e-mails for the receiving domain are managed and as soon as it gets this information, it creates a connection into the remote POP/IMAP server to see if the recipient mailbox exists. If it does, the SMTP server sends the message body and the receiving server sends it to the mailbox where the recipient can open it up and read it. Without an SMTP server on your server, you won't be allowed to send emails at all.