Skip to main content

Postmaster NDR resubmit Tool

Hot on the heels of last weeks resubmit tool I decided to rework this a little so it could also be used to resubmit messages from an NDR notification that may have been wrongly addressed. If you have configured your SMTP virtual servers to send a copy of Non delivery Recipients to a mailbox you’ll get a copy of all the NDR’s your server produces. Now in a large environment this is probably next to useless because of the number of messages you may receive but in small companies it may be a reasonable thing to do to allow you catch mis-addressed emails. But once you have received a badly addressed email if you try to resubmit that email from the NDR using Outlook (Resend) the sender address will be set to your email address which may confuse replies. So what this tool does it firstly extracts the original message from the NDR (if possible) and then allows you to specify the proper email address you want to submit it to and it will then resubmit the email so when it arrives at the recipients mailbox it will have the correct sender address.

Technically this works the same as the post from last week it uses two ASP pages and Exoledb in the background to query a folder for NDR messages. And then it use CDOEX to extract the original message from the NDR and then it uses the stream interface to submit the message to the pick directory.

Using the tool

The two asp pages that make up this tool use Exoledb as the underlying mechanism to access the Exchange Store. This means that the pages must be run locally on an Exchange server where the postmaster or notifcation mailbox is located. To run the tool it needs to be put into a directory usually under the default website (eg create a directory under wwwroot called ndrresub) that has NTLM authentication enabled (via IIS admin). Because this was a really simple tool I’ve also hard coded the Pickup directory in the ASP file so if you have the pick directory set to any other directory other then “c:\Program Files\Exchsrvr\Mailroot\vsi 1\PickUp” you need to change the following line in expresub.asp file

dim rec,oCon,Href,msgobj,resub,Subject,Toaddress,pickupdirectory,rfcmsg
pickupdirectory = "c:\Program Files\Exchsrvr\Mailroot\vsi 1\PickUp"

This tool is desinged to be used against the postmasters mailbox so you should have the pages located on the server where the postmaster mailbox is and then to access the mailbox type the OWA url to the inbox eg http://servername/exchange/administrator/inbox. The main page of this application is called ndrmain.asp so if you have placed the files in a directory called ndrresub under wwwroot you should be able to access the tool by using http://servername/ndrresub/ndrmain.asp .

Download

I’ve put a donwloadable copy of the 2 asp pages here


The following code segment illustrates the main differences.

im rec,oCon,Href,msgobj,msgobj1,resub,Subject,Toaddress,pickupdirectory,rfcmsg
pickupdirectory = "c:\Program Files\Exchsrvr\Mailroot\vsi 1\PickUp"
Resub = request.form("resub")
Subject = request.form("Subject")
Toaddress = request.form("Toaddress")
set rec = createobject("ADODB.Record")
Set oCon = CreateObject("ADODB.Connection")
Href = request.querystring("Href")
oCon.ConnectionString = Href
oCon.Provider = "ExOledb.Datasource"
oCon.Open
set msgobj = createobject("CDO.Message")
msgobj.datasource.open Href,oCon,3
set objattachments = msgobj.attachments
for each objattachment in objattachments
if objAttachment.ContentMediaType = "message/rfc822" then
set msgobj1 = createobject("cdo.message")
msgobj1.datasource.OpenObject objattachment, "ibodypart"
exit for
end if
next
if Resub = "Yes" then
response.write "Message Resubmitted to :" & Toaddress
msgobj1.fields("urn:schemas:mailheader:subject") = Subject
msgobj1.fields.update
set stm = msgobj1.getstream
stm.type = 2
stm.Charset = "x-ansi"
rfcmsg = stm.readtext
rfcmsg = "x-sender: " & msgobj1.fields("urn:schemas:httpmail:fromemail") & vbcrlf & rfcmsg
rfcmsg = "x-receiver: " & Toaddress & vbcrlf & rfcmsg
stm.position = 0
stm.writetext = rfcmsg
Randomize ' Initialize random-number generator.
rndval = Int((20000000000 * Rnd) + 1)
stm.savetofile pickupdirectory & "\" & day(now) & month(now) & year(now) & hour(now) & minute(now) & rndval & ".eml"
else

Popular posts from this blog

The MailboxConcurrency limit and using Batching in the Microsoft Graph API

If your getting an error such as Application is over its MailboxConcurrency limit while using the Microsoft Graph API this post may help you understand why. Background   The Mailbox  concurrency limit when your using the Graph API is 4 as per https://docs.microsoft.com/en-us/graph/throttling#outlook-service-limits . This is evaluated for each app ID and mailbox combination so this means you can have different apps running under the same credentials and the poor behavior of one won't cause the other to be throttled. If you compared that to EWS you could have up to 27 concurrent connections but they are shared across all apps on a first come first served basis. Batching Batching in the Graph API is a way of combining multiple requests into a single HTTP request. Batching in the Exchange Mail API's EWS and MAPI has been around for a long time and its common, for email Apps to process large numbers of smaller items for a variety of reasons.  Batching in the Gr...
Read more

Exporting and Uploading Mailbox Items using Exchange Web Services using the new ExportItems and UploadItems operations in Exchange 2010 SP1

Two new EWS Operations ExportItems and UploadItems where introduced in Exchange 2010 SP1 that allowed you to do a number of useful things that where previously not possible using Exchange Web Services. Any object that Exchange stores is basically a collection of properties for example a message object is a collection of Message properties, Recipient properties and Attachment properties with a few meta properties that describe the underlying storage thrown in. Normally when using EWS you can access these properties in a number of a ways eg one example is using the strongly type objects such as emailmessage that presents the underlying properties in an intuitive way that's easy to use. Another way is using Extended Properties to access the underlying properties directly. However previously in EWS there was no method to access every property of a message hence there is no way to export or import an item and maintain full fidelity of every property on that item (you could export the...
Read more

EWS Create Mailbox folder Powershell module for Exchange and Office365 Mailboxes

This is a rollup post for a couple of scripts I've posted in the past for creating folders using EWS in an Exchange OnPremise or Exchange online Cloud mailbox. It can do the following Create a Folder in the Root of the Mailbox Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test Create a Folder as a SubFolder of the Inbox Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Inbox' Create a Folder as a SubFolder of the Inbox using EWS Impersonation Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Inbox' -useImpersonation Create a new Contacts Folder as a SubFolder of the Mailboxes Contacts Folder Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Contacts' -FolderClass IPF.Contact Create a new Calendar Folder as a SubFolder of the Mailboxes Calendar Folder Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -Parent...
Read more
All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.