Some users receive this error message when sending emails via Outlook 2010:
Your message has not reached some or all recipients.
Subject: TEST
Sent on: 12.01.2012 19:17
The following recipient(s) cannot be reached:
‚frank@frankysweb.de‘ am 12.01.2012 19:17
None of your e-mail accounts can send messages to this recipient.
The problem occurs when users click on a mailto: link to send a mail. There is a hotfix for this problem, which can be downloaded here:
http://support.microsoft.com/kb/2597052
Don't be surprised, the hotfix is for Word 2010. Word is used by Outlook as an e-mail editor.