I can sned emails to myself in Exchange 2010 from both internal and external.
If I send from my old exchange server 2003, I receive the email in my mew email server 2010 but when i reply the email goes into (who no where?)
So I am guessing my outbound from exchange 2010 is not working, but it can receive emails from exchange 2010. I have tested this using a internal email address and I have sent a email from my gmail account. I received both but when I reply the reply never get back to me?