Hi Pierre/Marina,
have experienced that error in the past, i used the following quote to solve the problem. Don't know where i got it (but by seeing contoso.com as an example in the text, it definately is from one of bill's employees  )
regards,
pim
Since we are downloading e-mails on the POP3 Connector from a domain that this server is not responsible for, we should not change the primary address on the Default domain policy. We will just add a secondary SMTP address (Not responsible) to match the ISP's domain that we are trying to download through the POP3 Connector, after that, we can either configure the User not to get updates from the Recipient Policy and configure the primary SMTP address for that user with the ISP's e-mail address (So the Reply-To when the users sends e-mail is correct), or a second Recipient Policy can be created to stamp the users with the proper SMTP address (again, make sure the ISP's domain is set as not responsible). If you do the second policy, then make the ISP domain the primary, note that this is going to stamp all users that match the criteria defined for that policy.
This is the description on the first resolution:
Open Exchange System Manager
Expand Recipients, Recipient Policies.
Open the properties for the Default Policy.
Go to the E-Mail Addresses (Policy) tab
Right now you should have an entry for your local active directory domain and for an X400 address.
Make sure you do not have an entry with your ISP's domain or a domain that you are not responsible for.
Click New, select SMTP.
In the address type the domain you are receiving e-mail for using the Pop3 Connector. (@contoso.com), Un-Check "This Exchange Organization is responsible for all mail delivery to this address".
Put a check on the newly added address, DO NOT CHANGE THE PRIMARY.
OK the changes and acknowledge the warnings.
Open the SBS Server Management console, click on USERS.
Find the User that is receiving the POP3 Connector e-mails and open it
(double click).
Go to the E-mail addresses tab.
Uncheck (on the bottom) "Automatically Update e-mail addresses based on the Recipient Policy.
Make the "u...@contoso.com" the Primary email, do not remove any other address from here.
Ok the changes.
Open the SBS Server Management console, click on Internet and E-mail.
On the right side click on "Manage POP3 E-Mail", then click on "Open POP3 Connector Manager"
Select the affected user's entry and re-select the Exchange Mailbox where the e-mails should be sent to, even if it showing the proper name already, go ahead and re-select it.
Ok the changes.
Proceed to re-start IIS, for that, open a command prompt and type IISRESET followed by Enter/Return
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