Senario:
External exchange server(aaa.com.au) has a forwarder on for mailbox@aaa.com.au to mailbox@bbb.com.au, but every time I send an email to mailbox@aaa.com.au I recevie an bounce back saying it was unable to deliver to mailbox@bbb.com.au.
Sending email directly to mailbox@bbb.com.au works fine; tested it internally and externally.
Any Suggestion?