In order for you to send out e-mails using an email address with your personal domain name, make sure that the company will give you usage of their SMTP server. The aforementioned is the software that permits e-mails to be sent out. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outbound email messages from apps, webmail and contact forms. Every time a message is sent, the SMTP server checks with all the DNS servers worldwide where the e-mails for the receiving domain name are managed and when it obtains this info, it connects to the remote POP/IMAP server to check if the recipient mail box exists. If it does, the SMTP server directs the email body while the receiving server delivers it to the mailbox where the recipient can open it up and see it. Without an SMTP server on your server, you won't be able to mail out e-mails in any way.