If you'd like to send out e-mails through an e-mail address with your domain, make sure that the company will give you access to their SMTP server. The aforementioned is the software enabling e-mail messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outbound emails from apps, webmail and contact forms. Every time 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 managed and as soon as it obtains this info, it connects to the remote POP/IMAP server to find out if the recipient mail box is out there. When it does, the SMTP server delivers the e-mail body and so the receiving server delivers it to the mailbox in which the recipient can open it and see it. Without having a SMTP server on your server, you will not be able to send out e-mails at all.