If you need to send emails through an e-mail address with your own domain, make sure that the provider will give you usage of their SMTP server. The latter is the software enabling e-mails to be sent out. SMTP is an abbreviation for Simple Mail Transfer Protocol and it handles all outgoing email messages from programs, webmail and contact forms. Every time a message is sent out, the SMTP server confirms with all the DNS servers throughout the world where the emails for the receiving domain are taken care of and as soon as it gets this info, it creates a connection into the remote POP/IMAP server to find out if the recipient mailbox is out there. In case it does, the SMTP server delivers the email body and so the receiving server delivers it to the mailbox in which the recipient can open it and read it. Without an SMTP server on your end, you won't be allowed to mail out messages in any way.