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Exchange 2K sending but not receiving

By biftuk ·
We have migrated to Exchange 2000 lately. The exchange server uses DNS to connect to the internet thru a router to a lease connection to our ISP. Right now we use POPBeamer as a POP3 gateway to forward mails to the exchange server. The problem is the exchange server sends message to Internet thru smtp port 25. But when we try "telnet localhost 25" it is not working. but it still sends out messages to the internet. that is not the problem. the problem is if we use smtp port 25, the POPBeamer is not working, can not connect to the Exchange server. when we change the port number on the property of the virtual smtp server to another number, POPBeamer works fine, and when we do "telnet localhost 27" for example, it works ok. but now the exchange server can not send messages to the internet. what could be the problem?
we are sure that this is not the problem of POPBeamer, because whenever we could telnet our Exchange server on a certain port, that port works fine for the POPBeamer. is there anything problem on our DNS? I have checked that but I dont' see anything wrong. Our exchange server is also a secondary DNS server, and also a Global catalog.

Please help

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by BFilmFan In reply to Exchange 2K sending but n ...

I believe thsi guide will assist you in resolving this issue. If it works on Port 27, but not Port 25, your firewall settings are most likely the issue.

http://www.microsoft.com/technet/prodtechnol/exchange/2000/maintain/13x2kada.mspx

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by biftuk In reply to Exchange 2K sending but n ...

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