If you wish to send e-mails using an e-mail address with your personal domain, you have to make sure that the company will provide you with access to their SMTP server. The latter is the software system which enables e-mails to be transmitted. SMTP is an abbreviation for Simple Mail Transfer Protocol and it addresses all outbound e-mails from programs, webmail and contact web forms. Whenever a message is sent, the SMTP server confirms with all the DNS servers globally where the emails for the receiving domain name are handled and when it gets this data, it connects into the remote POP/IMAP server to check if the recipient mailbox is available. When it does, the SMTP server sends the message body and the receiving server delivers it to the mail box where the recipient can open it and see it. Without having a SMTP server on your server, you will not be able to send messages in any way.