Skip to main content

Processing attachments in a embedded email message

I had a question from someone today about how to process the attachments on a embedded email (basically when you get an email that has another email attached to it which has attachments). The basic code to process a set of attachments on a message in Ex2k look like this

set msg = createobject("cdo.message")
msg.datasource.open "file://./backofficestorage/domain.com/MBX/user/Inbox/Mess.EML"
set objattachments = msg.attachments
for each objattachment in objattachments
     objattachment.savetofile "d:\temp\" & objattachment.filename
next

If you have an email with a embedded email as an attachment this embedded email will appear in the attachment well of the the other email as content type message/rfc822 but the filename will be blank and the above code would fail to execute at this step. To process these type of messages you need to open the embedded message from the bodypart and then process the attachments on this message. The other problem now is that the depth of embedded email could be greater then just one so this is when some sort of function you can call recursively is really needed within your code. Embedded email extraction is covered in the Exchange SDK here . Here's some code to extract multiple depth attachments in a multiple embedded message.

set msg = createobject("cdo.message")
msg.datasource.open "file://./backofficestorage/domain.com/MBX/user/Inbox/Mess.EML"
set objattachments = msg.attachments
for each objattachment in objattachments
if objAttachment.ContentMediaType = "message/rfc822" then
procattach(objattachment)
else
objattachment.savetofile "d:\temp\" & objattachment.filename
end if
next
set msg = nothing

function procattach(objattachment)
set msg1 = createobject("cdo.message")
msg1.datasource.OpenObject objattachment, "ibodypart"
set objattachments1 = msg1.attachments
for each objattachment1 in objattachments1
if objAttachment1.ContentMediaType = "message/rfc822" then
procattach(objattachment1)
else
objattachment1.savetofile "d:\temp\" & objattachment1.filename
end if
next
set msg1 = nothing
end function



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

EWS-FAI Module for browsing and updating Exchange Folder Associated Items from PowerShell

Folder Associated Items are hidden Items in Exchange Mailbox folders that are commonly used to hold configuration settings for various Mailbox Clients and services that use Mailboxes. Some common examples of FAI's are Categories,OWA Signatures and WorkHours there is some more detailed documentation in the https://msdn.microsoft.com/en-us/library/cc463899(v=exchg.80).aspx protocol document. In EWS these configuration items can be accessed via the UserConfiguration operation https://msdn.microsoft.com/en-us/library/office/dd899439(v=exchg.150).aspx which will give you access to either the RoamingDictionary, XMLStream or BinaryStream data properties that holds the configuration depending on what type of FAI data is being stored. I've written a number of scripts over the years that target particular FAI's (eg this one that reads the workhours  http://gsexdev.blogspot.com.au/2015/11/finding-timezone-being-used-in-mailbox.html is a good example ) but I didn't have a gene...
Read more

Sending a MimeMessage via the Microsoft Graph using the Graph SDK, MimeKit and MSAL

One of the new features added to the Microsoft Graph recently was the ability to create and send Mime Messages (you have been able to get Message as Mime for a while). This is useful in a number of different scenarios especially when trying to create a Message with inline Images which has historically been hard to do with both the Graph and EWS (if you don't use MIME). It also opens up using SMIME for encryption and a more easy migration path for sending using SMTP in some apps. MimeKit is a great open source library for parsing and creating MIME messages so it offers a really easy solution for tackling this issue. The current documentation on Send message via MIME lacks any real sample so I've put together a quick console app that use MSAL, MIME kit and the Graph SDK to send a Message via MIME. As the current Graph SDK also doesn't support sending via MIME either there is a workaround for this in the future my guess is this will be supported.
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.