If you'd like to send e-mail messages through an email address with your domain name, make sure that the company will give you usage of their SMTP server. The aforementioned is the software which allows email messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it deals with all outbound e-mails from apps, webmail and contact web forms. Whenever a message is sent, the SMTP server checks with all of the DNS servers around the world where the e-mails for the receiving domain are managed and as soon as it obtains this information, it will connect to the remote POP/IMAP server to find out if the recipient mailbox is out there. When it does, the SMTP server directs the email body and so the receiving server sends it to the mail box where the recipient can open it and read it. Without having a SMTP server on your server, you won't be allowed to send out emails at all.