SMTP will not start

Hello - I am embarking on my first install of Leopard Server. I ca nreceive mail, but cannot send it. The log shows that SMTP will not start. I have looked through the main.cf file in Postfix, but can't see anything that may be prohibiting from starting. I am not that familiar with Postfix. All of the server options are at the defaults. Receiving mail (IMAP) works fine. The server has a static IP address and it's own domain name. The DNS suffix of the server uses the same suffix as another system does. This server is a test server. The other system being: "company.com", my server is named "server.company.com". The e-mail addresses for the test server users are user@server.company.com, whereas the main system would have user@company.com. In setup I did notice that the server had for itself, the name "company.com" instead of "server.company.com". I changed it in the Server Console. Could this be a factor? SSH, Web, sharing all work fine via the server's FQDN. Should OS X servers use themselves for DNS, like Windows Active Directory servers do at times?

Thanks