If you wish to send e-mail messages using an e-mail address with your own domain name, you have to make sure that the company will provide you with usage of their SMTP server. The aforementioned is the software system which enables email messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it deals with all outgoing email messages from apps, webmail and contact web forms. Every time a message is sent, the SMTP server checks with the DNS servers throughout the world where the emails for the receiving domain name are managed and once it gets this data, it connects to the remote POP/IMAP server to find out if the recipient mail box is available. In case it does, the SMTP server sends the email body while the receiving server delivers it to the mailbox in which the recipient can open it and read it. With no SMTP server on your server, you won't be capable to mail out messages in any way.