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No NDR is created for big mails

14/10/2008 - 15:12 von Bloomy | Report spam
Hi alll,

Problem description:
We have a NDR problem on our Exchange server. We have a mail size
restriction on the global level of our server so that Exchange Server allows
only mails smaller than 10 MB. In this restriction, the mails bigger than 10
MB will not be delivered, BUT a NDR notifying should be created and sent to
the mail recipients and Exchange admin mailbox. Unfortunately, if an external
sender sends a mail bigger than 10 MB, the recipients or admin did not get
any notifying (NDR) from our server. On the other side the internal users,
which send mails bigger than 10 MB, get NDRs without any problem.
NDRs are created for all other things. For example if the user not exists,
etc.

If we set logging on maximum for mail transport, information store, etc. we
can see two Event IDs 9012 and 6015. Event ID 9012 says that the sended
message is bigger than 10 MB is and there is a message size restriction on
the global level and a DSN will be sent to all recipients. Event ID 6015 says
that the categorizer modul sent now a NDR to the recipient with the mail
address testuser@realdomain.org and the error code is 0xc00402dc.
Unfortunately no NDR is received by testuser@realdomain.org or by our admin
account which we defined that admin should get a copy of NDR messages.

We have checked all possible potential error sources, but we could not find
out any configuration problem. Perhaps you can help us. Here are our
environment in Detail:

!All server or domain names below are changed here!
- Exchange Server 2003 with SP2 (exch2003) in a Windows Server 2003 AD
(myad.biz)
- Automatocally notifying, non-delivery reports, etc. all are enabled
- The mail size restriction is set only on global level for all Exchange
organization.
- Message Fildering for Sender/Recipient/etc is NOT activated.
- Exchange Server is responsible for the following mail domains (recipient
policy settings):
realdomain.org
realdomain.eu (primary mail domain)
intern.realdomain.org
myad.biz (internal AD domain)
local.realdomain.org
- Exchange Server is not open for the world. We use as SMTP relay a linux
server (forwarder.provider.net) of our provider. This relay server fordwards
also all mails from Internet to our Exchange Server. We created a SMTP
connector for the mail transport between Exchange Server und provider SMTP
server. This connection is accomplished by using an admin user mail account
(post@realdomain.org). This connection is password protected. The forwrder
server is defined as Smart Host on this SMTP connector.
- Another connector exists as fax connector and has the following
objectCategory (ExchDump tool is used):
objectCategory :
"CN=ms-Exch-Mail-Gateway,CN=Schema,CN=Configuration,DC=myad,DC=net"
And routing list for this connector is:
routingList : (ARRAY)
"LOCAL:SYS:*;1"
"LOCAL:FAX:*;1"
- Our provider is reponsible also for MX. The MX records are created for
realdomain.org and realdomain.eu. These MXs are pointed to the provider
forwarder server (forwarder.provider.net) in the world.

Can anyone help us? If you want, we can send much more information.

Best Regards
Bloomy
 

Lesen sie die antworten

#1 Walter Steinsdorfer [MVP]
14/10/2008 - 17:05 | Warnen spam
HI Bloomy,

Problem description:
We have a NDR problem on our Exchange server. We have a mail size
restriction on the global level of our server so that Exchange Server
allows
only mails smaller than 10 MB. In this restriction, the mails bigger than
10
MB will not be delivered, BUT a NDR notifying should be created and sent
to
the mail recipients and Exchange admin mailbox. Unfortunately, if an
external
sender sends a mail bigger than 10 MB, the recipients or admin did not get
any notifying (NDR) from our server. On the other side the internal users,
which send mails bigger than 10 MB, get NDRs without any problem.
NDRs are created for all other things. For example if the user not exists,
etc.



as you can expect the "de" in "microsoft.public.de.exchange" stands for
"Deutschland", so we are used to write in german here.

To your question: If you connect via telnet to your server and type "ehlo"
in the cmd, you can see the size-restriction. With 8-Bit smtp the connection
is dropped bevor the message is copied to your server. REsponsible for
delivering the ndr is the sending mta, so you do not get any ndr or
admin-message. This behavior is as expected and conform with RFC 2821.

Viele Grüsse aus München

Walter Steinsdorfer
MVP Exchange Server
www.exusg.de
http://www.amazon.de/Exchange-Serve...382732484X

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