Removing attachments of a specific type with EWS and Powershell

Sometimes particular attachments can create different issues for a number of different reasons so you might find you want to get rid of all those attachments without removing the messages they are attached to. If you find yourself in this situation then this is the sample for you.

Firstly to find the attachments of a specific type we use the following AQS query

System.Message.AttachmentContents:.pdf

This acts as a first level filter but it will give a few false positives so a second client level check of the actual Attachment file name is needed.

foreach ($Attachment in $Item.Attachments)
{
if($Attachment -is [Microsoft.Exchange.WebServices.Data.FileAttachment]){
if($Attachment.Name.Contains(".pdf")){
}
}
}

The following script can be run in one of two modes , Report will just report on attachments that are found in a particular folder and Delete will delete attachments from messages within that folder. I've put a download of this script here the code itself looks like.

$RunMode = Read-Host "Enter Mode for Script (Report or Delete)"
switch($RunMode){
"Report" {$runokay = $true
"Report Mode Detected"
}
"Delete" {$runokay = $true
"Delete Mode Detected"
}
default {$runOkay = $false
"Invalid Reponse you need to type Report or Delete"
}
}
if($runokay){
## Get the Mailbox to Access from the 1st commandline argument
$MailboxName = (Read-Host "Enter mailbox to run it against(email address)" )
$rptcollection = @()
## Load Managed API dll
Add-Type -Path "C:\Program Files\Microsoft\Exchange\Web Services\1.2\Microsoft.Exchange.WebServices.dll"
[System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
[System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms")
## Set Exchange Version
$ExchangeVersion = [Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2010_SP2
## Create Exchange Service Object
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService($ExchangeVersion)
## Set Credentials to use two options are availible Option1 to use explict credentials or Option 2 use the Default (logged On) credentials
#Credentials Option 1 using UPN for the windows Account
$psCred = Get-Credential
$creds = New-Object System.Net.NetworkCredential($psCred.UserName.ToString(),$psCred.GetNetworkCredential().password.ToString())
$service.Credentials = $creds
#Credentials Option 2
#service.UseDefaultCredentials = $true
## Choose to ignore any SSL Warning issues caused by Self Signed Certificates
## Code From http://poshcode.org/624
## Create a compilation environment
$Provider=New-Object Microsoft.CSharp.CSharpCodeProvider
$Compiler=$Provider.CreateCompiler()
$Params=New-Object System.CodeDom.Compiler.CompilerParameters
$Params.GenerateExecutable=$False
$Params.GenerateInMemory=$True
$Params.IncludeDebugInformation=$False
$Params.ReferencedAssemblies.Add("System.DLL") | Out-Null
$TASource=@'
namespace Local.ToolkitExtensions.Net.CertificatePolicy{
public class TrustAll : System.Net.ICertificatePolicy {
public TrustAll() {
}
public bool CheckValidationResult(System.Net.ServicePoint sp,
System.Security.Cryptography.X509Certificates.X509Certificate cert,
System.Net.WebRequest req, int problem) {
return true;
}
}
}
'@
$TAResults=$Provider.CompileAssemblyFromSource($Params,$TASource)
$TAAssembly=$TAResults.CompiledAssembly
## We now create an instance of the TrustAll and attach it to the ServicePointManager
$TrustAll=$TAAssembly.CreateInstance("Local.ToolkitExtensions.Net.CertificatePolicy.TrustAll")
[System.Net.ServicePointManager]::CertificatePolicy=$TrustAll
## end code from http://poshcode.org/624
## Set the URL of the CAS (Client Access Server) to use two options are availbe to use Autodiscover to find the CAS URL or Hardcode the CAS to use
#CAS URL Option 1 Autodiscover
$service.AutodiscoverUrl($MailboxName,{$true})
"Using CAS Server : " + $Service.url
#CAS URL Option 2 Hardcoded
#$uri=[system.URI] "https://casservername/ews/exchange.asmx"
#$service.Url = $uri
## Optional section for Exchange Impersonation
#$service.ImpersonatedUserId = new-object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress, $MailboxName)
$PR_FOLDER_TYPE = new-object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition(13825,[Microsoft.Exchange.WebServices.Data.MapiPropertyType]::Integer);
$folderidcnt = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::MsgFolderRoot,$MailboxName)
# Bind to the Contacts Folder
$rfRootFolder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$folderidcnt)
#Define the FolderView used for Export should not be any larger then 1000 folders due to throttling
$fvFolderView = New-Object Microsoft.Exchange.WebServices.Data.FolderView(1000)
#Deep Transval will ensure all folders in the search path are returned
$fvFolderView.Traversal = [Microsoft.Exchange.WebServices.Data.FolderTraversal]::Deep;
$psPropertySet = new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties)
$PR_Folder_Path = new-object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition(26293, [Microsoft.Exchange.WebServices.Data.MapiPropertyType]::String);
#Add Properties to the Property Set
$psPropertySet.Add($PR_Folder_Path);
$fvFolderView.PropertySet = $psPropertySet;
#The Search filter will exclude any Search Folders
$sfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo($PR_FOLDER_TYPE,"1")
$fiResult = $null
#
$Treeinfo = @{}
$TNRoot = new-object System.Windows.Forms.TreeNode("Root")
$TNRoot.Name = "Mailbox"
$TNRoot.Text = "Mailbox - " + $MailboxName
#The Do loop will handle any paging that is required if there are more the 1000 folders in a mailbox
do {
$fiResult = $Service.FindFolders($folderidcnt,$sfSearchFilter,$fvFolderView)
foreach($ffFolder in $fiResult.Folders){
#Process folder here
$TNChild = new-object System.Windows.Forms.TreeNode($ffFolder.DisplayName.ToString())
$TNChild.Name = $ffFolder.DisplayName.ToString()
$TNChild.Text = $ffFolder.DisplayName.ToString()
$TNChild.tag = $ffFolder.Id.UniqueId.ToString()
if ($ffFolder.ParentFolderId.UniqueId -eq $rfRootFolder.Id.UniqueId ){
$ffFolder.DisplayName
[void]$TNRoot.Nodes.Add($TNChild)
$Treeinfo.Add($ffFolder.Id.UniqueId.ToString(),$TNChild)
}
else{
$pfFolder = $Treeinfo[$ffFolder.ParentFolderId.UniqueId.ToString()]
[void]$pfFolder.Nodes.Add($TNChild)
if ($Treeinfo.ContainsKey($ffFolder.Id.UniqueId.ToString()) -eq $false){
$Treeinfo.Add($ffFolder.Id.UniqueId.ToString(),$TNChild)
}
}
}
$fvFolderView.Offset += $fiResult.Folders.Count
}while($fiResult.MoreAvailable -eq $true)
$Script:clickedFolder = $null
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Folder Select Form"
$objForm.Size = New-Object System.Drawing.Size(600,600)
$objForm.StartPosition = "CenterScreen"
$tvTreView1 = new-object System.Windows.Forms.TreeView
$tvTreView1.Location = new-object System.Drawing.Size(1,1)
$tvTreView1.add_DoubleClick({
$Script:clickedFolder = $this.SelectedNode.tag
$objForm.Close()
})
$tvTreView1.size = new-object System.Drawing.Size(580,580)
$tvTreView1.Anchor = "Top,left,Bottom"
[void]$tvTreView1.Nodes.Add($TNRoot)
$objForm.controls.add($tvTreView1)
$objForm.ShowDialog()
$clickedfolderid = new-object Microsoft.Exchange.WebServices.Data.FolderId($Script:clickedFolder)
#Define Attachment Contet To Search for
$AttachmentContent = ".pdf"
$AQSString = "System.Message.AttachmentContents:$AttachmentContent"
#Define ItemView to retrive just 1000 Items
$ivItemView = New-Object Microsoft.Exchange.WebServices.Data.ItemView(1000)
$fiItems = $null
do{
$fiItems = $service.FindItems($clickedfolderid,$AQSString,$ivItemView)
#[Void]$service.LoadPropertiesForItems($fiItems,$psPropset)
foreach($Item in $fiItems.Items){
$Item.Load()
$attachtoDelete = @()
foreach ($Attachment in $Item.Attachments)
{
if($Attachment -is [Microsoft.Exchange.WebServices.Data.FileAttachment]){
if($Attachment.Name.Contains(".pdf")){
if($RunMode -eq "Report"){
$rptObj = "" | Select DateTimeReceived,Subject,AttachmentName,Size
$rptObj.DateTimeReceived = $Item.DateTimeReceived
$rptObj.Subject = $Item.Subject
$rptObj.AttachmentName = $Attachment.Name
$rptObj.Size = $Attachment.Size
$rptcollection += $rptObj
}
$Attachment.Name
if($RunMode -eq "Delete"){
$attachtoDelete += $Attachment
}
}
}
}
$updateItem = $false
foreach($AttachmentToDelete in $attachtoDelete){
if($RunMode -eq "Delete"){
$Item.Attachments.Remove($AttachmentToDelete)
$updateItem = $true
}
}
if($updateItem){$Item.Update([Microsoft.Exchange.WebServices.Data.ConflictResolutionMode]::AlwaysOverWrite)};
}
$ivItemView.Offset += $fiItems.Items.Count
}while($fiItems.MoreAvailable -eq $true)
if($RunMode -eq "Report"){
$rptcollection | Export-Csv -Path c:\temp\$MailboxName-AttachmentReport.csv -NoTypeInformation
}
}

How to test SMTP using Opportunistic TLS with Powershell and grab the public certificate a SMTP server is using

Most email services these day employ Opportunistic TLS when trying to send Messages which means that wherever possible the Messages will be encrypted rather then the plain text legacy of SMTP. This method was defined in RFC 3207 "SMTP Service Extension for Secure SMTP over Transport Layer Security" and there's a quite a good explanation of Opportunistic TLS on Wikipedia https://en.wikipedia.org/wiki/Opportunistic_TLS . This is used for both Server to Server (eg MTA to MTA) and Client to server (Eg a Message client like Outlook which acts as a MSA) the later being generally Authenticated. Basically it allows you to have a normal plain text SMTP conversation that is then upgraded to TLS using the STARTTLS verb. Not all servers will support this verb so if its not supported then a message is just sent as Plain text. TLS relies on PKI certificates and the administrative issue s that come around certificate management like expired certificates which is why I wrote th

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