If you wish to send out emails using an e-mail address with your personal domain name, you have to make sure that the company will give you usage of their SMTP server. The aforementioned is the software which allows e-mails to be sent out. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outgoing emails from applications, webmail and contact forms. Whenever a message is sent, the SMTP server checks with all of the DNS servers globally where the e-mails for the receiving domain are taken care of and as soon as it acquires this data, it creates a connection to the remote POP/IMAP server to check if the recipient mail box is out there. If it does, the SMTP server directs the message body and so the receiving server delivers it to the mail box where the recipient can open it and read it. Without having a SMTP server on your end, you will not be able to send messages in any way.