If you want to send email messages through an e-mail address with your personal domain, you have to make sure that the company will give you usage of their SMTP server. The latter is the software that allows e-mails to be transmitted. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound email messages from programs, webmail and contact forms. Whenever a message is sent, the SMTP server confirms with the DNS servers worldwide where the e-mails for the receiving domain name are managed and when it obtains this info, it creates a connection to the remote POP/IMAP server to check if the recipient mail box is out there. When it does, the SMTP server transmits the email body and so the receiving server sends it to the mail box in which the recipient can open it up and see it. With no SMTP server on your server, you won't be able to send e-mails in any way.