I have recently installed Outlook 2007 but seem to have a problem. It
receives but will not send emails.
I received the following message:

Your message did not reach some or all of the intended recipients.
Subject: FW: email
Sent: 19/05/2010 11:15 am
The following recipient(s) cannot be reached:
Named person on 19/05/2010 11:15 am
Invalid recipient

I use the Contacts list to store and select names. Am running on XP SP3.

I can still use Outlook Express for sending.