If you wish to send out email messages using an email 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 which enables e-mails to be transmitted. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outgoing e-mails from apps, webmail and contact forms. Every time a message is sent, the SMTP server confirms with all the DNS servers around the world where the emails for the receiving domain name are taken care of and as soon as it obtains this data, it will connect to the remote POP/IMAP server to check if the recipient mailbox is available. If it does, the SMTP server directs the message body and then the receiving server delivers it to the mail box where the recipient can open it up and see it. Without having a SMTP server on your end, you will not be able to send out emails at all.