Excahnge not accepting email

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Hello,

Our exchange server 2000 sp3 on windows 2000 sp4 is not accepting all email.
If I look in the SMTPSVC1 log, servers that try to connect starting with " IP
- - " are rejected, but those that start with "IP HELO" or "EHLO" are
accepted and are routed fine.

Accepted:

16:45:23 163.125.103.104 EHLO - 250
16:45:23 163.125.103.104 MAIL - 250
16:45:23 163.125.103.104 RCPT - 250
16:45:23 163.125.103.104 DATA - 250
16:45:25 216.17.169.156 HELO - 250
16:45:25 216.17.169.156 MAIL - 250
16:45:25 216.17.169.156 RCPT - 250
16:45:25 216.17.169.156 RCPT - 250

Rejected:

16:45:25 206.16.192.227 - - 0
16:45:25 206.16.192.227 EHLO - 0
16:45:25 206.16.192.227 - - 0
16:45:25 206.16.192.227 MAIL - 0
16:45:25 206.16.192.227 - - 0
16:45:25 206.16.192.227 RCPT - 0
16:45:25 206.16.192.227 - - 0
16:45:25 206.16.192.227 DATA - 0
16:45:25 206.16.192.227 - - 0
16:45:25 206.16.192.227 - - 0
16:45:25 206.16.192.227 QUIT - 0
16:45:26 206.16.192.227 - - 0

TIA,

Eric
.

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