If you wish to send 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 aforementioned is the software system which enables e-mails to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound emails from apps, webmail and contact forms. Whenever a message is sent, the SMTP server confirms with all the DNS servers throughout the world where the emails for the receiving domain are handled and once it gets this info, it creates a connection to the remote POP/IMAP server to check if the recipient mailbox is available. When it does, the SMTP server delivers the e-mail body and so the receiving server delivers it to the mail box in which the recipient can open it up and read it. Without having a SMTP server on your server, you will not be capable to send out messages in any way.