If you need to send email messages through an e-mail address with your own domain name, you have to make sure that the provider will provide you with access to their SMTP server. The aforementioned is the software which allows e-mails to be sent out. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outbound email messages from programs, webmail and contact web forms. When a message is sent out, the SMTP server confirms with all the DNS servers worldwide where the emails for the receiving domain name are taken care of and as soon as it acquires this information, it creates a connection to the remote POP/IMAP server to check if the recipient mail box is out there. In case it does, the SMTP server transmits the message body while the receiving server sends it to the mailbox in which the recipient can open it and see it. Without an SMTP server on your end, you won't be able to mail out emails at all.