Exchange_Connectivity error: 'Mail connectivity is down' (NETIQKB25267)

Error: Your message did not reach some or all of the intended recipients.
Subject: 1047392322: <9694>: EASOHSHUB02 to EASOHSE2KMB01
Sent: 3/11/2003 9:19 AM

The following recipient(s) could not be reached:

/O=ETN/OU=CLEOH/cn=Configuration/cn=Servers/cn=EASOHSE2KMB01/cn=Microsoft
System Attendant on 3/11/2003 9:19 AM
The e-mail address could not be found. Perhaps the recipient
moved to a different e-mail organization, or there was a mistake in the
address. Check the address and try again.

Check that the e-mail addresses of Exchange System attendant exist and/or are set correctly.

1. Open the Active Directory Site and Services snap-in.

2. Right-click the Active Directory Site and Services container in the left pain and click View and Show Services Node.

3. Open the container to the following path:
   
   Services\Microsoft Exchange\Organization_Name\Administrative Groups\Site_Name\Servers\Exchange2000_ServerName\Microsoft System Attendant
   
   
4. Right-click the Microsoft System Attendant and click Properties.

5. In the E-mail Addresses tab, if no E-mail address is listed, click New and set the appropriate addresses.  Mostly SMTP and X400 addresses are needed.

6. Click OK.

7. Check that mail routing is working.

8. Check that the mailbox and the profile AppManager refers are set appropriately.
    

Microsoft System Attendant mailbox is encountering problems

Formerly known as NETIQKB25267

For additional resource, please contact Microsoft support to further troubleshoot the System Attendant Mailbox Problem

Below are some Microsoft Technet Articles that may help in further troubleshooting the error:

http://support.microsoft.com/default.aspx?scid=kb;en-us;289549
http://support.microsoft.com/default.aspx?scid=kb;en-us;301020
http://support.microsoft.com/default.aspx?scid=kb;en-us;284204