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Direct dial-up: Routing when no messages are transferred

I have a Group Of Domino Servers(5.0.2c) under a single Notes Domain running on NT and connected on WAN. One Domino Server(5.0.6a) is configured to send and recieve SMTP mails. For this all the Notes domain servers (5.0.2c) are using the field "Relay Host for Messages Leaving Local Internet Domain" in the Server-Configuration document.

Now, I have configured a Domino server (5.0.2c), which will be connected to the rest of the Notes domain servers using modem (COM port) Notes Direct Dialup. And now my problem is that this Domino Server(5.0.2c) is unable to send SMTP mails to the Domino server(5.0.6a). It is giving the following error message:

"Router: No messages transferred to xxx.xxx.xxx.xxx(host xxx.xxx.xxx.xxx) via SMTP: Server not responding", "Router: Failed to connect to SMTP host xxx.xxx.xxx.xxx because Server not responding".
Direct dial-up? Wow, that had to be an absolute last resort. You should set up connection documents to route every x minutes and/or with x messages. Make the message number extremely high, so that the time interval is what determines the call. Have the connection connect over Notes Direct Dialup, and the routing task set to Mail Routing. There is no need to route these SMTP within your own Domino domain. Only the SMTP server/host needs to route via SMTP to the external hosts.

Dig Deeper on Lotus Notes Domino Administration Tools

MS Exchange Transport errors Since April 3, I've been getting the following MS ExchangeTransport Event ID 7010 error in the application log of our Exchange 2k3 server with Exchange 2k3. I can't seem to resolve the problem.

This is an SMTP protocol log for virtual server ID 1, connection #1640. The client at "xxx.xxx.xxx.xxx." sent a "xexch50" command, and the SMTP server responded with "504 Need to authenticate first." The full command sent was "xexch50 2256 2". This will probably cause the connection to fail.

I've looked at the MS link, and have tried everything suggested; including setting the NIC manually rather than automatically. All the patches are up to date, and mail seems to be working fine. However I cannot use the cmdprmt telnet test even within the LAN. The only machine it works from is the server itself. The number of servers trying to connect is limited that I seem to get the error on. It's making me nervous though. This is an SMTP protocol log for virtual server ID 1, connection #1503. The client at "" sent a "rcpt" command, and the SMTP server responded with "550 5.7.1 Unable to relay for echo@chuansheng.com." The full command sent was "rcpt TO: echo@chuansheng.com." This will probably cause the connection to fail. I interpret this as an attempt to relay mail thru our server. The SMTP log seems to indicate that the connection simply drops. I've tried to simply get rid of the error by turning the MSExhangeTransport logging level to minimum but I 'm still getting them.

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