I just rolled out SBS 2011 with Exchange 2010 on it. Everything is working great.
I have discovered that a few emails do not go through to their destination. (Less than 1%).
I suspect that I have not properly configured my DNS with the minimum required entries for best practices.
The only thing I did was to create an MX record but I did not create an SPF or PTR or rDNS or anything else.
Can someone give me a list of the records I need to be running under best practices with the least chance of problems?