If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.
C:\Documents and Settings\Administrator.KCFE>netstat -anb | findstr :25
TCP 0.0.0.0:25 0.0.0.0:0 LISTENING 1636
UDP 0.0.0.0:25713 *:* 1548
UDP 0.0.0.0:25198 *:* 1548
UDP 0.0.0.0:2566 *:* 1548
UDP 0.0.0.0:2565 *:* 1548
UDP 0.0.0.0:2564 *:* 1548
UDP 0.0.0.0:25976 *:* 1548
UDP 0.0.0.0:2550 *:* 1548
UDP 0.0.0.0:25933 *:* 1548
UDP 0.0.0.0:25674 *:* 1548
UDP 0.0.0.0:25145 *:* 1548
UDP 0.0.0.0:2528 *:* 1548
UDP 0.0.0.0:25910 *:* 1548
UDP 0.0.0.0:25894 *:* 1548
UDP 0.0.0.0:25636 *:* 1548
UDP 0.0.0.0:25888 *:* 1548
UDP 0.0.0.0:25110 *:* 1548
UDP 0.0.0.0:25622 *:* 1548
UDP 0.0.0.0:25615 *:* 1548
UDP 0.0.0.0:25100 *:* 1548
UDP 0.0.0.0:25871 *:* 1548
UDP 0.0.0.0:25099 *:* 1548
UDP 0.0.0.0:25096 *:* 1548
UDP 0.0.0.0:25609 *:* 1548
UDP 0.0.0.0:25348 *:* 1548
UDP 0.0.0.0:25344 *:* 1548
UDP 0.0.0.0:25591 *:* 1548
UDP 0.0.0.0:25072 *:* 1548
UDP 0.0.0.0:25584 *:* 1548
UDP 0.0.0.0:25069 *:* 1548
UDP 0.0.0.0:25578 *:* 1548
UDP 0.0.0.0:25568 *:* 1548
UDP 0.0.0.0:25052 *:* 1548
UDP 0.0.0.0:25304 *:* 1548
UDP 0.0.0.0:25816 *:* 1548
UDP 0.0.0.0:25556 *:* 1548
UDP 0.0.0.0:25546 *:* 1548
UDP 0.0.0.0:25277 *:* 1548
UDP 0.0.0.0:25528 *:* 1548
UDP 0.0.0.0:25527 *:* 1548
UDP 0.0.0.0:25463 *:* 1548
UDP 0.0.0.0:25775 *:* 1548
UDP 0.0.0.0:25758 *:* 1548
UDP 0.0.0.0:25240 *:* 1548
UDP 0.0.0.0:25994 *:* 1548
UDP 0.0.0.0:25729 *:* 1548
With regards to your previous questions. It is McAfee VirusScan Enterprise 8.5. And I have just checked the SMTP virtual server Authentication settings and it is on.
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Can you remote onto another computer in the school and test telnet locally?
If that works - it points squarely to the Cisco. If not - then it might be the AV software.
http://support.microsoft.com/kb/153119