Unable to Send Mails to Some Domains (Full Version)

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balakrishna -> Unable to Send Mails to Some Domains (23.Sep.2009 6:15:39 AM)


Advance Thanks to Every one.

Here I have Exchange Server 2007 Installed in Server 2008.

I unable to send mail to Some domains. I received the Undeliverable Message i attached Below.I tried with Owa Access also Still I Unable to do any thing. Please Any one know Please Reply me ASAP.

#553 sorry, that domain isn't in my list of allowed rcpthosts; no valid cert for gatewaying (#5.7.1) ##
Original message headers:
Received: from dfcl.deccan.int ([2002:ac01:314::ac01:314]) by dfcl.deccan.int
([2002:ac01:314::ac01:314]) with mapi; Wed, 23 Sep 2009 15:40:10 +0530
From: Test <Test@yyyyyy.com>
To: xxxxx@xxxx.comDate: Wed, 23 Sep 2009 15:40:04 +0530
Subject: test
Thread-Topic: test
Thread-Index: AQHKPDYIXyCSvVNiWEG8e3nh4mY3nQ==
Message-ID: <DEDFE4D0AD82DB4394A279B5745B77F6030003C4195A@dfcl.deccan.int>
Accept-Language: en-US
Content-Language: en-US
acceptlanguage: en-US
Content-Type: multipart/alternative;
MIME-Version: 1.0
Regards,Bala Krishna

jveldh -> RE: Unable to Send Mails to Some Domains (23.Sep.2009 6:39:43 AM)


It looks like the mailserver on the other side uses a list of allowed senders. Besides that it is requesting a certificate but can't find one.

If you would like to send to that server with certificate authentication ensure that the public part of the key is provided to the other mailserver and vice versa.

Besides this things make sure your external DNS is configured correctly:

- contains a PTR record (http://www.emailtalk.org/PTR.aspx)

Also make sure that fqdn on the send connector is configured correctly in the HELO field.

balakrishna -> RE: Unable to Send Mails to Some Domains (23.Sep.2009 7:33:43 AM)

Thanks For your Replay.

I checked Every thing We dont have PTR Record. But Some times we can able to Send the Mail to That Server some time its Bounce Backing. I dont know why ?

Bala Krishna G

jveldh -> RE: Unable to Send Mails to Some Domains (23.Sep.2009 4:27:07 PM)


If you don't have a ptr this can cause issus because some mailservers you send mail to may do a reverse lookup which can't be performed if an incorrect or no ptr record is there.

Modem56k -> RE: Unable to Send Mails to Some Domains (24.Sep.2009 12:52:08 PM)

Does Exchange 2007 automatically do a reverse lookup or do you have to set that.. how can i check this.. ?

jveldh -> RE: Unable to Send Mails to Some Domains (24.Sep.2009 3:17:27 PM)


Yes Exchange can do it, since Exchange 2007 it's integrated in the Sender Reputation anti-spam agent. This can run on both the Edge and HUB server. In case of the hub-server you will need to install it using the powershell command: install-antispamagents.ps1


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