I would add a tip to help you verify your SPF record. Send an e-mail from the server in question to a test GMAIL.COM account, open the e-mail in Gmail and at the top right of the message click the dropdown and select "Show Original" and GMAIL will say in its headers whether our not the sending server is permitted in the SPF record on a line that begins like this:
Received-SPF:
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by: alanhardistyPosted on 2009-11-06 at 10:04:30ID: 25761406
There are several problems with your domain:
Once you have corrected these issues, your mail should flow more easily.