Unknown Error on Outlook (0x80040201)

[Jaspercasper]

When Sending and Receiving I get an error message Sending' reported error (0x80040201): 'Unknown Error 0x80040201'
My system is Vista and using Microsoft Office 2007. How do I repair this error?
I'd like to thank you in anticipation for your help
Regards

 

[DelJo63]

I found this with google

I encountered this same problem. I created a new profile and used the same .pst from the original profile and got the same error. It turned out the e-mail was trying to be sent to a contact that didn't have a valid e-mail address associated with it. Once I corrected this it worked fine. Hope this helps!