If you wish to send out emails using an email address with your own domain name, make sure that the company will provide you with access to their SMTP server. The latter is the software system which enables e-mails to be transmitted. SMTP is an acronym for Simple Mail Transfer Protocol and it manages all outgoing email messages from apps, webmail and contact web forms. When a message is sent out, the SMTP server confirms with all the DNS servers globally where the e-mails for the receiving domain are handled and once it obtains this information, it creates a connection to the remote POP/IMAP server to check if the recipient mail box is available. If it does, the SMTP server delivers the message body and so the receiving server sends it to the mail box where the recipient can open it up and read it. With no SMTP server on your end, you won't be capable to send emails at all.