In order for you to send email messages through an email address with your very own domain, make sure that the provider will provide you with usage of their SMTP server. The latter is the software system allowing emails to be sent out. SMTP is an acronym for Simple Mail Transfer Protocol and it handles all outgoing email messages from applications, webmail and contact web forms. Whenever a message is sent out, the SMTP server confirms with all the DNS servers worldwide where the e-mails for the receiving domain name are taken care of and once it acquires this info, it connects into the remote POP/IMAP server to check if the recipient mail box is available. In case it does, the SMTP server directs the e-mail body and the receiving server sends it to the mail box where the recipient can open it up and read it. Without having a SMTP server on your end, you won't be able to mail out e-mails in any way.