If you'd like to send email messages through an email address with your domain name, make sure that the provider will provide you with access to their SMTP server. The latter is the software system enabling e-mail messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outbound e-mails from apps, webmail and contact web forms. Whenever a message is sent out, the SMTP server confirms with all of the DNS servers globally where the e-mails for the receiving domain name are taken care of and when it gets this information, it will connect to the remote POP/IMAP server to check if the recipient mail box exists. If it does, the SMTP server directs the e-mail body while the receiving server delivers it to the mail box where the recipient can open it up and read it. With no SMTP server on your end, you will not be capable to send out messages at all.