Setting up incoming email to a web part Sharepoint 2007 with Exchange 2007.

Hey guys / gals,
I am trying to get a web part to receive email from domain and non-domain users.
Environment: (For security these are not the real email address, IP addresses or FQDN.)
Sharepoint 2007 – sharepoint.domain1.domain2.com Public IP 74.XXX.XXX103 Priv. IP – 192.168.6.103
 Exchange 2007 -  exchange.domain1.domain2.com Public IP 74.XXX.XXX.104 Priv. IP – 192.168.6.104
(Sharepoint and Exchange are in the same Public and private subnets and Domain)
 Postini inbound and outbound filtering
When I configure a web part to receive incoming email, the default email address is webpart@sharepointserver.domain1.domain2.com. I have set up the relay on Exchange to pass email to sharepoint.domain1.domain2.com. I have added the FQDN sharepoint.domain1.domain2.com  to Postini as an alias.
Error Message when sending email to webpart@sharepointserver.domain1.domain2.com  from a domain account.
Generating server: exchange.domain1.domain2.com
webpart@sharepointserver.domain1.domain2.com
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##
The address that was created in AD was a ‘contact’ for webpart@sharepointserver.domain1.domain2.com  not a user.
If this has been address before can you point me to a link with my apologies? Thanks all for the help!
Chip
Cehlers1159Asked:
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Justin SmithSr. System EngineerCommented:
In order for SharePoit to recieve email, the SMTP service has to be running on the WFE server(s).  Did you do this?

Good info: http://www.combined-knowledge.com/Downloads/2007/How%20to%20configure%20Email%20Enabled%20Lists%20in%20Moss2007%20RTM%20using%20Exchange%202007.pdf
Cehlers1159Author Commented:
I am running Windows 2003 32 bit Standard R2 on the Sharepoint server and yes, I do have the SMTP service running...I should have metioned that in the questions...Thanks!
Justin SmithSr. System EngineerCommented:
Have you verified the correct email addresses exist on the contact, in Exchange?  You have set up a connector the the sharePoint box, right?
Cehlers1159Author Commented:
The email address is correct in the contact. As far as the connector, can you elaborate? I have the relay set up on the exchange server. I am replacing a disgrunted predecessor who felt that any kind of documentation was optional...Thanks
Justin SmithSr. System EngineerCommented:
A connector to tell Exchange to send all email destined for @sharepointserver.domain.com to the SharePoint box.  

Have you taken a look at the white paper I posted?

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