If you want to send emails using an e-mail address with your domain, make sure that the provider will give you access to their SMTP server. The latter is the software system which enables e-mail messages to be sent out. SMTP is an acronym for Simple Mail Transfer Protocol and it deals with all outbound email messages from apps, webmail and contact web forms. Every time a message is sent out, the SMTP server confirms with all of the DNS servers worldwide where the e-mails for the receiving domain name are taken care of and as soon as it acquires this data, it connects to the remote POP/IMAP server to see if the recipient mail box exists. In case it does, the SMTP server sends the e-mail body and so the receiving server delivers it to the mailbox where the recipient can open it up and read it. Without having a SMTP server on your server, you will not be allowed to mail out messages in any way.