If you'd like to send out email messages using an email address with your personal domain, you have to make sure that the provider will give you usage of their SMTP server. The latter is the software which enables emails to be transmitted. SMTP is an abbreviation for Simple Mail Transfer Protocol and it addresses all outgoing email messages from programs, webmail and contact web forms. Whenever a message is sent out, the SMTP server confirms with all of the DNS servers throughout the world where the emails for the receiving domain are taken care of and when it acquires this info, it connects into the remote POP/IMAP server to find out if the recipient mailbox exists. In case it does, the SMTP server directs the message body and then 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 server, you will not be able to send messages at all.