If you need to send out e-mail messages using an email address with your personal domain name, make sure that the company will give you access to their SMTP server. The latter is the software which enables email messages to be dispatched. SMTP is an abbreviation for Simple Mail Transfer Protocol and it addresses all outgoing email messages from apps, webmail and contact forms. When a message is sent, the SMTP server confirms with all the DNS servers around the world where the e-mails for the receiving domain name are taken care of and once it gets this information, it creates a connection to the remote POP/IMAP server to check if the recipient mail box exists. In case it does, the SMTP server transmits the e-mail body and so the receiving server sends it to the mailbox where the recipient can open it up and see it. Without an SMTP server on your end, you won't be allowed to send messages at all.