If you need to send emails through an e-mail address with your personal domain, you have to make sure that the company will give you access to their SMTP server. The aforementioned is the software system which allows e-mails to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outbound emails from programs, webmail and contact web forms. Whenever a message is sent out, the SMTP server checks with the DNS servers throughout the world where the e-mails for the receiving domain are taken care of and when it acquires 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 transmits the e-mail body and then the receiving server delivers it to the mailbox in which the recipient can open it up and read it. With no SMTP server on your end, you won't be allowed to send e-mails in any way.