If you wish to send e-mail messages using an e-mail address with your domain, you have to make sure that the provider will provide you with access to their SMTP server. The aforementioned is the software system which permits emails to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it addresses all outgoing email messages from applications, webmail and contact web forms. Every time a message is sent out, the SMTP server checks with all the DNS servers globally where the e-mails for the receiving domain are taken care of and when it gets this information, it connects to the remote POP/IMAP server to see if the recipient mailbox is available. If it does, the SMTP server delivers the email body while the receiving server sends it to the mail box in which the recipient can open it and see it. Without having a SMTP server on your server, you will not be capable to mail out e-mails at all.