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Not able to send mail to few domains

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Not able to send mail to few domains - 18.Jun.2008 8:55:10 AM

bhagyesh

Posts: 3
Joined: 13.Oct.2006
Status: offline

Hi,

We have installed Exchange 2007 enterprise version with Edge Server. All is working well, even Active Sync is working well. So basically the setup is done perfectly.

But since we have deployed exchange we are not able to send mails to some of the domains like tvcabo.co.mz, aol.com, lam.co.mz.

We have tried doing all the major task, even configure the reverse proxy, already talked with the ISP to put the reverse proxy and they have done it. But still we are not able to send mail.

All the mails stay at the edge server with this error:

Last error on domain : 541 4.4.0 Primary traget IP address responded with : "421 4.4.2 Connection dropped." Attempted failover to alrernate host, but that did not succeed. Either there are no alternate host, or delivery failed to all alternate hosts.

Last Error on mail properties : 421 4.4.2 Connection dropped

We are not understanding what we can do more. If any one have an idea to solve this issue please assist. I will appreciate your effort.

Thanks and Regards
B Patel.

Post #: 1

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RE: Not able to send mail to few domains - 18.Jun.2008 12:57:06 PM

antonv

Posts: 5
Joined: 3.Apr.2008
Status: offline

We had exactly the same problem on some domains. It looked as a "broken pipelining" problem, due to our proxy server. The smtp command "354 go ahead" from the other party to initiate the transmission of the data did not reach our server through our proxy gateway.
Look in the send transportlogs. We had the choice to either install ISA server as a gateway or define another send connector for the unreachable domains.
We configured a new send connector for these domains and forwarded the mail to the mailserver of our ISP.
all is going smoothly now.

Anton

(in reply to bhagyesh)

Post #: 2

RE: Not able to send mail to few domains - 19.Jun.2008 3:04:23 AM

bhagyesh

Posts: 3
Joined: 13.Oct.2006
Status: offline

I have configured a new send connector for those domains and forwarded the mail to the mail server of our ISP. But still not working.

Just to confirm if i am doing right.

1. Given the domain names which i am not able to send on Address Space.
2. On the Network given the Mail Server IP of our ISP, and even the domain of our ISP.
3. On the Source I have provided our AD server.

Can you please suggest / comments if i am doing write or something missing.

B Patel.

(in reply to antonv)

Post #: 3

RE: Not able to send mail to few domains - 20.Jun.2008 4:28:46 PM

antonv

Posts: 5
Joined: 3.Apr.2008
Status: offline

Check the following:
Address space: domain names of unreachable domains: unreachable.com
Network: Route mail through smarthost: enter ip-address of mailserver of isp, (i did not check external dns)
source server: should be the name of the exchange server, enter it by browsing

that should do the job. if you succeed or not please reply

anton

(in reply to bhagyesh)

Post #: 4

RE: Not able to send mail to few domains - 7.Aug.2009 1:01:47 PM

Ritchy

Posts: 1
Joined: 7.Aug.2009
Status: offline

Hello,

try to Use another DNS Server in Your Router, or Server...

That's a Problem with DNS Binding to the Target-Domain and There's MX-Resolver by your ISP.

Example: OpenDNS (208.67.222.222. or 208.67.220.220).

Greets
Ritchy

(in reply to antonv)

Post #: 5

RE: Not able to send mail to few domains - 30.Sep.2009 5:15:15 PM

sanket.shah

Posts: 1
Joined: 30.Sep.2009
Status: offline

The reason behind this is that Exchange is not configured correctly for MX entries.

Run the Exchange Management Tools for more help.

If trouble still persists, check the Send Connector.

_____________________________

Sanket Shah
-Master in CRM and Exchange Integration
-MCTS - Web, Windows .NET 2.0
-MCTS - SQL Server 2005
-BrainBench C# Certified Professional

(in reply to Ritchy)

Post #: 6