If you'd like to send email messages through an email address with your personal domain, you have to make sure that the provider will provide you with usage of their SMTP server. The aforementioned is the software that allows email messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it addresses all outgoing email messages from applications, webmail and contact web forms. When a message is sent, the SMTP server confirms with all of the DNS servers globally where the emails for the receiving domain name are taken care of and once it obtains this info, it connects into the remote POP/IMAP server to find out if the recipient mailbox exists. In case it does, the SMTP server delivers the email body and so the receiving server sends it to the mailbox in which the recipient can open it and see it. With no SMTP server on your server, you will not be allowed to send out emails in any way.