If you'd like to send out email messages using an e-mail address with your personal domain, you have to make sure that the company will provide you with access to their SMTP server. The aforementioned is the software which permits emails to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outbound emails from apps, webmail and contact forms. When 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 as soon as it obtains this data, it will connect into the remote POP/IMAP server to check if the recipient mail box is out there. When it does, the SMTP server delivers the e-mail body while the receiving server delivers it to the mailbox in which the recipient can open it up and see it. Without having a SMTP server on your server, you won't be capable to send out e-mails in any way.