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Exchange messages?

Posted on 2001-07-30
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Last Modified: 2008-02-01
We have Exchange forwarding all mail to a postfix linux server.  When a mail bounces many of the NDRs are in exchange language rather than the postfix language.

Is it possible that exchange is interpreting the postfix error messages and then formatting them in exchange format and sending them?  The reason is the messages that come back aren't very useful...

then I have to go into the postfix box and check the log files.

Any help would be greatly appreciated.
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Question by:blood
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by:cscharff
ID: 6336344
An example of this would be?

Exchange reports errors which are transmitted by the sending/receiving MTA, error messages which are sent by another MTA aren't touched.

Most of the SMTP related error messages reported by Exchange are based on the RFC821 error codes.
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by:bluezoo7
ID: 6338314
Assuming the NDRs are from outgoing messages that did not make it to the recipient, it sounds like the Exchange server is being used to send mail out.

So when a message is not delivered, the NDR is sent back to the sending server (in this case, Exchange) which then forwards the NDR to the Linux server.

bz7
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by:blood
ID: 6341114
An example is:

      xxxxxx@xxxxxxxx.co.jp  2001 07 28 17:08
            The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.
            < mx2.xxxxxxxx.com #4.0.0>


We have the exchange server sending out ALL mail (other than Exchange mail) to a linux server.  That server should (and is currently) the sendmail server for all of our outgoing mail.   This is why I don't understand the message, unless exchange was trying to do something behind the scenes.

Thank you guys for helping... I appreciate it.
-Jay
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by:bluezoo7
ID: 6341651
It could be that Exchange is trying to do a DNS lookup on the address before sending to the Linux server and failing.

Also check that the address is valid.

bz7
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by:cscharff
ID: 6343138
4.0.0 is apparently a persistent transient failure. I'd suggest using the IP address of the server (probably in brackets) instead of the DNS name and turning up logging if the condition persists in order to see what the actual conversation might be.

Also, make sure that Exchange and your DC/GCs are running the latest service packs and hotfixes.
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by:blood
ID: 6345637
The address is valid... and from here I can connect to :  www.xxxxx-xxx.co.jp

but if I try and telnet to 25 on xxxxxx-xxx.co.jp I don't get a mailer response... but I do on www.xxxxx-xxxx.co.jp!

This tells me that it could very well be a DNS issue, but I don't see where (or why) my DNS server is having problems only resolving .co.jp (or .co.kr.. or .co.uk) addresses.  I don't know everything about DNS.. so I can't see where the problem would be.

Thanks,
Jay
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by:bluezoo7
ID: 6346329
That means that the server in Japan that responds to "www" is listening on port 25.

Maybe the problem is not with your DNS, but with the xxx.xxx.co.jp domain's authorative DNS.

Try sending a mail message from Yahoo or Hotmail and see if it is delivered successfully. If not, the problem is probably not with your DNS.

If it does not pose a security risk to you or to the .co.jp domain, and you are willing to share the domain you are trying to reach, we can run some NS lookups on the domain to see what DNS servers around the Internet have in their databases for the domain. No pressure though.

bz7
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by:blood
ID: 6346635
actually... I don't really know why i have kept that masked... it was just 1 email that was supposed to go there.

The domain is:   office-one.co.jp

This has also happened with a few other servers in Japan as well.

the email would be xxxxx@office-one.co.jp

You could check that out for me and that would be cool =)

Thanks,
Jay



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by:cscharff
ID: 6347009
Mail for office-one.co.jp is handled by svr1.office-one.co.jp (5) 202.238.25.157 www also happens to be a C name record for the same address. I tried to connect to it from here and it failed... could eb the server is not up constantly or link conditions are causing transmission errors.
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by:cscharff
ID: 6347027
Actually it did answer... it just took a really long time. You might be able to adjust your SMTP timeout values, but that link seems a bit iffy.
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by:bluezoo7
ID: 6349877
Ping times to 202.238.25.157 (the jp mail server) are only ~160ms. Not bad if the server's really in Japan. I also experienced a very slow connection to the mail server. Looks like they're using Sendmail.

I fear the problem is not a network one, but a server issue on their end. There may not be much you can do except to attempt to contact the e-mail admin at office-one and report the slowness.

bz7
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by:blood
ID: 6458490
I am curious about a statement made above.

BTW:  The problem still happens, but on a less frequent basis... so either their mailserver is more reliable or something else changed.

--!--
Someone mentioned (I think it was bluezoo) that the NDR should be sent back to the mailserver that it was sent from.

In this case, @mydomain.com email is pointed at our exchange server.  Even though all outgoing mail is routed to 2 postfix servers... all MX records for mail @mydomain.com point to the exchange server.

Not only that, but the 2 postfix servers only accept SMTP connections from within our trusted network (behind the firewall).  It would not be possible for another machine to author an SMTP message back to those servers becuase they will not answer to SMTP from any other addresses.

So... I guess I am answering my own question here... The mail servers that would be sending an NDR would look up @mydomain.com and route the message to the machine on my MX record... correct?   This would mean that the NDRs are getting sent from the server directly to the Exchange server without touching the actual machine that really sent them in the first place.

Is this correct?

thanks a ton!
-jay
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by:bruintje
ID: 7270463
Hello blood

this question is open for more then 2 months
time to clean up
if not stated otherwise

my recom will be
-PAQ and refund
-this will be finalized by an EE Moderator
-with no further update (15.09.2002)

PLEASE DO NOT ACCEPT THIS COMMENT AS ANSWER

HAGD:O)Bruintje
posted by ToolzEE v1.0
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Jgould earned 0 total points
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Question has been closed as per recommendation

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