If you wish to send out e-mail messages using an e-mail address with your personal domain, you have to make sure that the provider will give you usage of their SMTP server. The latter is the software system which permits email messages to be transmitted. SMTP is an abbreviation for Simple Mail Transfer Protocol and it addresses all outbound emails from apps, webmail and contact forms. Every time a message is sent out, the SMTP server checks with all of the DNS servers globally where the e-mails for the receiving domain name are managed and as soon as it obtains this data, 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 transmits the message body and the receiving server sends it to the mail box where the recipient can open it up and see it. Without having a SMTP server on your server, you won't be capable to mail out e-mails in any way.