The below message is generated when an Outlook 2007/2010 client clicks on a e-mail address link from a Word document in the form of mailto:email@example.com, now typically as a hyperlink there is no problem but if it is formatted mailto:mailto:firstname.lastname@example.org and unusual errors occurs. When sending e-mail messages from the regular Outlook client the below message occurs.
Delivery has failed to these recipients or groups:
A problem occurred and this message couldn’t be delivered. Check to be sure the e-mail address is correct. If the problem continues, please contact your helpdesk.
Diagnostic information for administrators:
Generating server: exchange_cas_server.liquidobject.com
#550 5.4.4 ROUTING.NoConnectorForAddressType; unable to route for address type ##
Now for Outlook 2007 there is a patch available (http://support.microsoft.com/kb/2475888/en-us?sd=rss&spid=11377) but for Outlook 2010 there is no patch. The word-around for 2010 is to use OWA or create a contact for the given user and then pull up the contact card for the user and select “Outlook Properties” and click on the “Internet type” button to convert the “e-mail type” from “MAILTO:” to “SMTP:”.