If you need to send e-mails through an email address with your domain name, you have to make sure that the company will give you access to their SMTP server. The aforementioned is the software system allowing email messages to be transmitted. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound email messages from programs, webmail and contact forms. When a message is sent, the SMTP server confirms with all of the DNS servers around the world where the e-mails for the receiving domain are handled and as soon as it acquires this info, it will connect into the remote POP/IMAP server to check if the recipient mail box exists. In case it does, the SMTP server sends the message body while the receiving server sends it to the mail box where the recipient can open it and read it. Without having a SMTP server on your end, you won't be allowed to mail out e-mails in any way.