Hi,
We have a CRM 2011. Deployed with EMail router configured with our exchange 2007. We were able to send mail to internal users with out any problems. But when trying to send emails to our dealers or newly created leads, We were facing the Mail Box Not found
or Unable to relay error.
I know that it is a relay problem that the exchange was unable to relay the mails outside the intranet (i.e. Our Domain). I had tried the below and no luck.
http://blogs.technet.com/b/exchange/archive/2006/12/28/3397620.aspx
Also the "Allow messages with unresolved e-mail recipients to be sent" was enable in CRM 2011.
Is it needed to have 2 separate connectors for Internal and external mails?
Please ask if you have any questions.