Re: Cannot telnet to host on port 25, but Exchange emails are send fin
- From: Joe <joe@xxxxxxxxxxxxxx>
- Date: Fri, 27 Jan 2006 15:42:57 +0000
StoreThomas wrote:
<snip details>Ok, this problem at one of our customers really bugs me.
The setup is SBS2003 SP1 server installed on a HP server.
So all of theese testing results tells me that there is something configured on the server that blocks all outgoing connections on port 25 except those comming from the Exchange server.
Can anyone please help me on this? Any way I can continue troubleshooting the issue, and hopefully find the reason for this behavior.
Do you have SBS Standard or Premium (with ISA installed) and two NICs?
This behaviour sounds exactly what you would normally want, and it seems likely you have ISA and it is responsible. I run single-NIC SBSes and block port 25 outbound on the routers from all other IP addresses, to achieve the same result.
Your real problem is probably unconnected with this. Exchange can deliver directly, just not to the smarthost. This sounds like the smarthost requires authentication, or at least to be configured to accept relay requests from your SBS. .
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