If you need to send out email messages through an e-mail address with your domain name, make sure that the provider will provide you with access to their SMTP server. The latter is the software system enabling e-mail messages to be sent out. SMTP is an abbreviation for Simple Mail Transfer Protocol and it deals with all outbound email messages from programs, webmail and contact web forms. When 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 gets this info, it creates a connection into the remote POP/IMAP server to check if the recipient mail box is available. In case it does, the SMTP server directs the message body and then the receiving server delivers it to the mailbox where the recipient can open it and see it. Without having a SMTP server on your server, you won't be capable to mail out emails at all.