In order for you to send out emails using an email address with your personal domain name, you have to make sure that the provider will provide you with usage of their SMTP server. The latter is the software that allows email messages to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound email messages from programs, webmail and contact web forms. Whenever a message is sent, the SMTP server confirms with all the DNS servers around the world where the emails for the receiving domain are taken care of and once it acquires this info, it creates a connection into the remote POP/IMAP server to find out if the recipient mailbox exists. When it does, the SMTP server directs the email body and so the receiving server sends it to the mailbox where the recipient can open it and read it. Without an SMTP server on your end, you won't be allowed to send out e-mails in any way.