If you would like to send e-mail messages using an e-mail address with your domain name, you have to make sure that the company will provide you with access to their SMTP server. The aforementioned is the software which enables e-mail messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it addresses all outbound e-mails from apps, webmail and contact forms. When 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 once it gets this information, it connects into the remote POP/IMAP server to see if the recipient mailbox is available. When it does, the SMTP server delivers the email body and so the receiving server sends it to the mail box in which the recipient can open it and see it. Without an SMTP server on your end, you will not be capable to mail out emails in any way.