If you wish to send emails through an email address with your domain, you have to make sure that the provider will give you usage of their SMTP server. The aforementioned is the software system enabling email messages 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. When a message is sent, the SMTP server checks with the DNS servers worldwide where the emails for the receiving domain are taken care of and when it gets this data, it connects to the remote POP/IMAP server to see if the recipient mail box is out there. If it does, the SMTP server directs the message body while the receiving server sends it to the mail box where the recipient can open it up and read it. With no SMTP server on your server, you won't be allowed to send out messages in any way.