In order for you to send out e-mails through an e-mail address with your very own domain name, make sure that the provider will provide you with access to their SMTP server. The latter is the software which allows e-mails to be transmitted. SMTP is an acronym for Simple Mail Transfer Protocol and it handles all outbound emails from apps, webmail and contact web forms. Every time a message is sent out, the SMTP server checks with the DNS servers worldwide where the emails for the receiving domain name are taken care of and once it acquires this data, it connects to the remote POP/IMAP server to see if the recipient mail box is out there. In case it does, the SMTP server directs the message body and the receiving server delivers it to the mailbox where the recipient can open it and see it. With no SMTP server on your end, you will not be capable to send messages in any way.