If you'd like to send emails through an email address with your personal domain, make sure that the company will give you access to their SMTP server. The aforementioned is the software system that permits emails to be transmitted. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outgoing e-mails from applications, webmail and contact forms. Every time a message is sent out, the SMTP server checks with all the DNS servers globally where the emails for the receiving domain are managed and once it gets this info, it creates a connection into the remote POP/IMAP server to find out if the recipient mail box is available. In case it does, the SMTP server delivers the email body and the receiving server sends it to the mail box where the recipient can open it up and see it. With no SMTP server on your end, you won't be allowed to mail out emails in any way.