I am having a problem with 1 user in my company who is getting the following message when sending to one Client:
"The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient"
I have tested sending a message to this user and it delivers and confirms that it has reached the server.
When I took a look at his reciopents in outlook I noticed that in message type (see attached file) the properties are set to mailto where as mine and all his other contacts are set to smtp.
We are using Exchange 2003 with outlook 2007.
Any thoughts on this? I must admit I have never noticed the mailto before.