Please help me see my user name is firstname.lastname@example.org I am one of the landing-mail address is mail.pcgator.org
We're just customers here. If you need to contact DreamHost, use the Support section of the panel:https://panel.dreamhost.com/index.cgi?tree=support.msg&
If you're having trouble with mail setup, see the Wiki:http://wiki.dreamhost.com/E-Mail_Client_Configuration
If it used to work, and has stopped, maybe we can help if you better describe the problem.