Need email server administrator / system admin

Our company has a dedicated server. When we send email, we must use the outgoing mail server of our ISP - example - [login to view URL] or mail.bellsouth.net. I would like for us to be able to use [login to view URL] (where [login to view URL] is the name of our domain). Right now, if we use [login to view URL] the emails will not be sent. Our budget is small for this project, please bid accordingly.