In order for you to send out e-mails through an e-mail address with your personal domain, make sure that the provider will give you usage of their SMTP server. The latter is the software which permits e-mail messages to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it addresses all outbound e-mails from apps, webmail and contact forms. Whenever a message is sent, the SMTP server checks with the DNS servers worldwide where the emails for the receiving domain name are handled and once it obtains this info, it creates a connection to the remote POP/IMAP server to see if the recipient mail box is out there. If it does, the SMTP server delivers the email body and then the receiving server delivers it to the mailbox in which the recipient can open it up and see it. Without an SMTP server on your server, you won't be able to mail out messages at all.