HELP- Can't Send/Receive in Exchange Lab

Problem: I can not send internet email or Receive internet email - 


I setup an internet Send-Connector using dns as well as trying to relay through AT&T with no luck
I added anonymous perms to the default receive connector
I added only 1 MX record for the CAS/HUB 192.168.1.83 on the only DC in DNS

I currently have GoDaddy set with my external domain of 

myXXX.net with the following entries in godaddy

@ = 107.X.X.X
mail = 107.x.x.x  This is my internet IP

I added myxxx.net as an Accepted domain - authoritative in my org

I am a beginner at dns so not sure if I need more MX records of external domain and where?
Do I open ports 25 only on my router pointing to CAS/HUb or DC, I think CAS/HUb..but tired?
DO I HAVE to relay through ISP?  How can i find out the correct at&t smtp server?
Internal email works fine of course, please help... can't sleep over this.  Need this to study for my test.

VMWARE Setup

Domain Controller - 2008 Server  DNS/AD  

192.168.1.80
255.255.255.0
192.168.1.254 ( UVERSE Router )

DNS - 192.168.1.80
      192.168.1.254

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XCH1 - CAS/HUB  Exchange 2010  - This box is unpingable from all boxes, yet it shows connected in EMC / SHELL

192.168.1.83
255.255.255.0
192.168.1.254

DNS - 192.168.1.80
      192.168.1.254
 
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XCH2 - Mailbox  Exchange 2010            

192.168.1.83
255.255.255.0
192.168.1.254

DNS - 192.168.1.80
      192.168.1.254

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