email

HI, are there any known mailing issues with this? My new users are not getting emails, and I’ve talked to my server (dedicated, at godaddy), and although the email works on the server side of things, my wordpress isn’t sending. I even got a plugin to configure smtp – set it to my rackspace email per rackspace instructions (simple hostname, username and password – no room for error), and yet email still not going out. Is there anything you know about this?