New exchange 2010 sp1 install - single server running roles. In Organization Configuration | Hub Transport | Accepted domains: et.local (our active directory domain name) = authoritative and DEFAULT = TRUE. Second domain: etfbank.org (our internet email addresses) = authoritative and DEFAULT = FALSE.
ISSUE: Users cannot send each other emails when using email@example.com to User2@etfbank.org, etc. But either one can successfully send and receive to any other internet email address domain (like: microsoft.com, google, gmail, aol, etc.)
They CAN send each emails if they send an email to firstname.lastname@example.org to email@example.com - obviously we are not using the etfb.local for our emails, but rather etfbank.org.
How do we fix this. THank you.