Exchange 2013 cannot send email to internet if client connects by IMAP/SMTP

Now I am testing Exchange 2013.
-Created a send connector.
-Start IMAP and IMAP background services.

If I use MAPI by outlook 2010, I can send email to internet address, however

if I use IMAP/smtp by outlook 2010 , I cannot send email to internet.  But I can send email to inetnal users.

And, on the Get-MessageTrackingLog, I cannot find the internet  mail addrress.
There are only internal "To addresses"

Server Environment
  -All in one,  CU2 installed

How can I proceed my troubleshooting ?
Please give me a hint!