If you need to send email messages through an e-mail address with your personal domain, make sure that the company will give you usage of their SMTP server. The latter is the software enabling e-mails to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound emails from programs, webmail and contact forms. When a message is sent out, the SMTP server confirms with all of the DNS servers throughout the world where the e-mails for the receiving domain are managed and as soon as it obtains this info, it creates a connection into the remote POP/IMAP server to find out if the recipient mail box exists. In case it does, the SMTP server sends the e-mail body while the receiving server sends it to the mailbox where the recipient can open it and read it. With no SMTP server on your server, you will not be capable to send emails in any way.