Hi all, well we have 2 exchange 2003 servers (back end/front end) and a mail filter appliance from ISS, everything was working fine till 3 days back, users cannot send any message, they can receive though.....whenever they try to send any message they get a bounced email saying the following:
The following recipient(s) cannot be reached:
<mailbox name> on 11/21/2007 9:14 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
MSEXCH:MSExchangeIS:/DC=xxx/DC=xxx/DC=xxxxx:<Back end server name>
Tried to add any user who faces this issue to the domain admins group, guess what? he can send email without any problems and that bounced email doesn't exist!!!
Last thing happened before that issue occured, was deploying a WSUS server that updated the exchange server with latest updates ( few security updates and exchange updates ) were added....If it is a microsoft patch that caused that problem, which one is it??? if it is something else that has to do with permissions and security, what can it be???
Please assist as soon as possible since its a very sensitive issue.