If you would like to send e-mail messages using an e-mail address with your personal domain, you have to make sure that the company will provide you with access to their SMTP server. The aforementioned is the software system that allows email messages to be sent out. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outgoing e-mails from applications, webmail and contact forms. Every time a message is sent out, the SMTP server confirms with all of the DNS servers around the world where the emails for the receiving domain are handled and once it gets this information, it creates a connection to the remote POP/IMAP server to see if the recipient mail box is out there. If it does, the SMTP server sends the message body and then the receiving server sends it to the mailbox where the recipient can open it and see it. Without having a SMTP server on your server, you won't be allowed to send out e-mails at all.