If you'd like to send out e-mail messages using an email address with your very own domain name, you have to make sure that the company will provide you with usage of their SMTP server. The latter is the software system enabling e-mail messages to be transmitted. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound email messages from apps, webmail and contact forms. When a message is sent out, the SMTP server confirms with the DNS servers around the world where the e-mails for the receiving domain are handled and as soon as it obtains this info, it creates a connection into the remote POP/IMAP server to find out if the recipient mailbox is available. When it does, the SMTP server sends the message body and the receiving server delivers it to the mail box in which the recipient can open it up and read it. Without having a SMTP server on your server, you won't be able to send e-mails in any way.