If you wish to send out emails using an e-mail address with your very own domain, make sure that the provider will give you usage of their SMTP server. The latter is the software system which allows email messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it handles all outgoing email messages from apps, webmail and contact forms. Every time a message is sent out, the SMTP server checks with the DNS servers throughout the world where the e-mails for the receiving domain are handled and once it obtains this info, it will connect into the remote POP/IMAP server to check if the recipient mail box exists. If it does, the SMTP server directs the email body while the receiving server delivers it to the mail box where the recipient can open it up and read it. Without an SMTP server on your end, you won't be allowed to send out emails at all.