If you want to send out emails using 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 which enables e-mail messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outbound email messages from apps, webmail and contact web forms. When a message is sent, the SMTP server confirms with all the DNS servers worldwide where the emails for the receiving domain are taken care of and as soon as it acquires this info, it creates a connection to the remote POP/IMAP server to see if the recipient mail box is out there. When it does, the SMTP server sends the message body and so the receiving server delivers it to the mailbox in which the recipient can open it up and see it. Without having a SMTP server on your server, you won't be able to send e-mails at all.