Skip to main content

Mail Enabling a Public folder with the EWS Managed API and finding and changing the primary email address without using Exchange cmdlets

If your working with Public Folders in the EWS Managed API then you may want to mailenable a new or existing Public Folder without using EMS cmdlets. I described a method that you can use to mail enable Public folders using EWS a while ago here and this same method will work with a little bit of different code. Like the previous post you need to set the following 2 properties to mail enabled a folder.


So if you want to mailenable an existing folder that you have the path for say its "firstlevel/secondlevel/newfolder" you will first need to have some code that will find the folder based on the path by doing a search. Then once you have the folder ID you can Bind to the folder and set those Mapi properties. Using a UpdateFolder operation was one of the harder operations in normal EWS proxy code but its now so much easier to do in the EWS Managed API.

Once you have set these properties a backgroup process will create the AD Proxy object for this public folder which will contain all the email address's assigned to this and any other folder specific setting such a limits etc. If you want to connect to this proxy object and change things like limits and email address you can use LDAP directly without using the EMS cmdlets. A little word or warning if you are going to be setting email addresses directly you should make sure you implement code that ensures you dont create duplicate email addresses. To find the ADProxy object you can get the AD GUID of the proxy object by retrieving the following property via EWS and then use this GUID value to access the AD object.

PR_PF_PROXY = 0x671D

This is a binary property which will be returned base64 encoded so you first need to decode this and the convert it to hex to use in a System.DirectoryServices.

So the code to MailEnable a folder using the EWS Managed API looks like

String fpfolderPath = "";
ExtendedPropertyDefinition PR_PF_PROXY = new ExtendedPropertyDefinition(0x671D, MapiPropertyType.Binary);
PropertySet PsPropertySet = new PropertySet(PR_PF_PROXY);
PsPropertySet.BasePropertySet = BasePropertySet.FirstClassProperties;
Folder PfRoot = Folder.Bind(service, WellKnownFolderName.PublicFoldersRoot,PsPropertySet);
String[] faFldArray = fpfolderPath.Split('/');
Folder tfTargetFolder = PfRoot;
for (int lint = 1; lint < fview =" new" searchfilter =" new" propertyset =" PsPropertySet;" ffresult =" service.FindFolders(tfTargetFolder.Id," totalcount ="=" tftargetfolder =" ffResult.Folders[0];" pr_publish_in_address_book =" new" pr_pf_proxy_required =" new">

To access the AD proxy object using the FolderID from the prevous piece of code

ExtendedPropertyDefinition PR_PF_PROXY = new ExtendedPropertyDefinition(0x671D, MapiPropertyType.Binary);
PropertySet PsPropertySet = new PropertySet(PR_PF_PROXY);
Folder meMailEnabledFolder = Folder.Bind(service, tfTargetFolder.Id, PsPropertySet);
String pfProxy = "";
byte[] pfPro = Convert.FromBase64String(meMailEnabledFolder.ExtendedProperties[0].Value.ToString());
pfProxy = BitConverter.ToString(pfPro);
DirectoryEntry deDirEnt = new DirectoryEntry(("LDAP://<GUID=" + pfProxy.Replace("-", "") + ">"));
PropertyValueCollection proxyAddresses = deDirEnt.Properties["proxyAddresses"];
if (proxyAddresses != null)
for (int ipar = 0; ipar < proxyAddresses.Count; ipar++)
if (proxyAddresses[ipar].ToString().Contains("SMTP:"))
proxyAddresses[ipar] = "";

I've put a download of this code here

Popular posts from this blog

Downloading a shared file from Onedrive for business using Powershell

I thought I'd quickly share this script I came up with to download a file that was shared using One Drive for Business (which is SharePoint under the covers) with Powershell. The following script takes a OneDrive for business URL which would look like This script is pretty simple it uses the SharePoint CSOM (Client side object Model) which it loads in the first line. It uses the URI object to separate the host and relative URL which the CSOM requires and also the SharePointOnlineCredentials object to handle the Office365 SharePoint online authentication. The following script is a function that take the OneDrive URL, Credentials for Office365 and path you want to download the file to and downloads the file. eg to run the script you would use something like ./spdownload.ps1 '

A walk-though using the Graph API Mailbox reports in Powershell

Quite recently the Reporting side of the Graph API has moved in GA from beta, there are quite a number of reports that can be run across various Office365 surfaces but in this post I'm going to focus on the Mailbox related ones. Accessing Office365 Reports using Powershell is nothing new and has been available in the previous reporting endpoint however from the end of January many of these cmdlets are now being depreciated in favour of the Graph API . Prerequisites  In comparison to using the Remote PowerShell cmdlets where only the correct Office365 Admin permissions where needed, to use the new Graph API reports endpoint you need to use OAuth for authentication so this requires an Application Registration  that is then given the correct oAuth Grants to use the Reports EndPoin

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 .  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
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.