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Outlook and 5.4.4 Routing Errors

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, now typically as a hyperlink there is no problem but if it is formatted 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:
#550 5.4.4 ROUTING.NoConnectorForAddressType; unable to route for address type ##

Now for Outlook 2007 there is a patch available ( 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:”.

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November 20, 2011 at 8:13 pm
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