If you want to send emails through an email address with your domain, make sure that the company will give you usage of their SMTP server. The latter is the software enabling e-mail messages to be sent. SMTP is an acronym for Simple Mail Transfer Protocol and it handles all outbound emails from programs, webmail and contact web forms. Whenever a message is sent, the SMTP server checks with all of the DNS servers around the world where the e-mails for the receiving domain name are taken care of and once it gets this data, it will connect to the remote POP/IMAP server to find out if the recipient mailbox exists. In case it does, the SMTP server directs the e-mail body and then the receiving server sends it to the mail box in which the recipient can open it up and read it. Without an SMTP server on your end, you won't be capable to send out messages at all.