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Unable to telnet to port 25 on Exchange server

By nathan.telschow ·
Hello,

I am working on an email problem that is starting to drive me nuts. I'm having a problem with certain emails get returned with the message:

You do not have permission to send to this recipient. For assistance, contact your system administrator.
<mail.mydomain.com #5.7.1 smtp;550 5.7.1 H:MXB<1.2.3.4>Connection refused due to abuse>

I'm running SBS 2003 and exchange server 2003 with the latest updates applied. I've been troublshooting a bit and discovered that outside of the network I can't telnet to port 25 on the mail server. The session seems to connect but I don't get an SMTP greeting and it shortly disconnects. I'm not positive this is causing the problem but it's somewhere to start. Any ideas? I've already ruled out the router as it doesn't matter if I'm internal or external.

I also tried opening a telnet session from the router itself and no go.

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by retro77 In reply to Unable to telnet to port ...

from within the local network try to telnet to port 25

Do you have a spam filter setup? It might be the one disconnecting your sessions.

Also verify that you have port 25 open through your firewall/router.

Do you have ISA installed on the SBS server? It will need port 25 opened as well.

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