If you wish to send e-mail messages using an email address with your own domain, make sure that the company will give you usage of their SMTP server. The aforementioned is the software system that enables e-mail messages to be sent. SMTP is an abbreviation for Simple Mail Transfer Protocol and it manages all outbound emails from apps, webmail and contact 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 name are handled and once it acquires this data, it will connect into the remote POP/IMAP server to find out if the recipient mailbox is available. If it does, the SMTP server delivers the message body and the receiving server delivers it to the mailbox where the recipient can open it up and see it. Without an SMTP server on your end, you will not be able to send emails at all.