If you wish to send emails through an e-mail address with your very own domain name, make sure that the company will give you usage of their SMTP server. The aforementioned is the software system allowing e-mail messages to be sent out. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outbound emails from apps, webmail and contact web forms. Every time a message is sent out, the SMTP server checks with all the DNS servers around the world where the e-mails for the receiving domain are managed and once it gets this info, it creates a connection to the remote POP/IMAP server to see if the recipient mail box is available. When it does, the SMTP server sends the message body and then the receiving server sends it to the mail box where the recipient can open it and read it. Without an SMTP server on your end, you won't be allowed to mail out messages at all.