If you need to send out email messages through an email address with your domain, make sure that the company will give you usage of their SMTP server. The aforementioned is the software system which enables emails to be transmitted. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound email messages from apps, webmail and contact web forms. Every time 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 once it acquires this information, it connects into the remote POP/IMAP server to see if the recipient mail box is available. If it does, the SMTP server transmits the email body and then the receiving server delivers it to the mail box in which the recipient can open it and read it. With no SMTP server on your server, you won't be able to send out messages in any way.