If you'd like to send email messages using an email address with your personal domain, you have to make sure that the provider will provide you with access to their SMTP server. The latter is the software system that enables email messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it addresses all outbound emails from apps, webmail and contact forms. Whenever a message is sent, the SMTP server checks with all the DNS servers throughout the world where the e-mails for the receiving domain name are managed and once it obtains this information, it connects to the remote POP/IMAP server to find out if the recipient mailbox exists. If it does, the SMTP server transmits the e-mail body and then the receiving server delivers it to the mailbox in which the recipient can open it up and read it. Without having a SMTP server on your end, you won't be able to mail out messages at all.