snooflehammer
asked on
Exchange server on same subnet as other servers from other domains will not transact mail with those other servers
As the title suggests, I have a block of IP addresses in which I have sat a number of servers running Exchange Server, of various versions.
They are all servers I am hosting for clients, and my Exchange Server is in the same block of IPs.
Each Exchange Server is for a different Internet domain, and works as expected, except one.
My server cannot send mail to one of the others. Investigation has found that it will not accept mail from any of the four other Exchange Servers on that block of IPs, either.
If I log on to any of the other Exchange Servers via RDP and Telnet to the rogue server (SBS 2008, Exchange 2007) on port 25 I get:
421 4.3.2 Service not available, closing transmission channel
I figured I would add all the IPs in the block to the Network tab of the default Receive Connector. After doing so I can Telent from any of the server in the IP block to the problem child on port 25 and it opens a connection.
HURRAH!
But, mail does not get through, and I get a message that it is queued for a later delivery attempt.
What else should I do?
They are all servers I am hosting for clients, and my Exchange Server is in the same block of IPs.
Each Exchange Server is for a different Internet domain, and works as expected, except one.
My server cannot send mail to one of the others. Investigation has found that it will not accept mail from any of the four other Exchange Servers on that block of IPs, either.
If I log on to any of the other Exchange Servers via RDP and Telnet to the rogue server (SBS 2008, Exchange 2007) on port 25 I get:
421 4.3.2 Service not available, closing transmission channel
I figured I would add all the IPs in the block to the Network tab of the default Receive Connector. After doing so I can Telent from any of the server in the IP block to the problem child on port 25 and it opens a connection.
HURRAH!
But, mail does not get through, and I get a message that it is queued for a later delivery attempt.
What else should I do?
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
This is the latest bounce message (sanitised) after I have attempted to whitelist the IPs in the IP block:
Diagnostic information for administrators:
Generating server: SENDINGSERVER.sendingdomai
testsend@receivingserver.c
SBS2008.receivingserver.lo
Original message headers:
Received: from SENDINGSERVER.sendingdomai
SENDINGSERVER.sendingdomai
20 Oct 2015 17:01:27 +1000
From: Me The Sender <MeTheSender@sendingdomain
To: "testsend@receivingserver.
Date: Tue, 20 Oct 2015 17:01:09 +1000
Subject: Tester 3
Thread-Topic: Tester 3
Thread-Index: AdELBReKCB1AFGVrT4W91eiWEa
Message-ID: <0E7D484632136044B4B370085
Accept-Language: en-US, en-AU
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US, en-AU
x-tm-as-product-ver: SMEX-11.1.0.1239-8.000.120
x-tm-as-result: No--42.453300-5.000000-31
x-tm-as-user-approved-send
x-tm-as-user-blocked-sende
Content-Type: multipart/alternative;
boundary="_000_0E7D4846321
MIME-Version: 1.0