I am facing an authentication failure issue while trying to connect for both IMAP and POP3 protocols using the Client Credential Grant flow for OAuth2.0
public static void connectPOP(String email, String accessToken){
Properties properties= new Properties();
properties.put("mail.pop3.port", 995);
properties.put("mail.pop3.forgettopheaders", "true");
properties.put("mail.pop3.auth.mechanisms", "XOAUTH2");
properties.put("mail.pop3.auth.login.disable", "true"); // If true, prevents use of the USER and PASS commands. Default is false.
properties.put("mail.pop3.auth.plain.disable", "true"); // If true, prevents use of the AUTH PLAIN command. Default is false.
properties.put("mail.pop3.auth.xoauth2.disable","false"); // If true, prevents use of the AUTHENTICATE XOAUTH2 command. Hence set it to false
properties.put("mail.pop3.auth.xoauth2.two.line.authentication.format", "true"); // If true, splits authentication command on two lines. Default is false.
properties.put("mail.pop3.connectiontimeout", 15000);
properties.put("mail.pop3.timeout", 15000);
properties.put("mail.debug", "true");
Session session = Session.getInstance(properties);
session.setDebug(true);
try{
Store store = session.getStore("pop3");
store.connect("outlook.office365.com", email, accessToken);
if(store.isConnected()){
System.out.println("Connected with pop3 successfully !");
}
}catch(Exception e){
e.printStackTrace();
}
}
Following are the credentials which I have used while performing the Client Credential Grant flow
userEmail:- Email of the user which is used to login to Azure portal (eg, email address removed for privacy reasons)
Note: I have been using the Default Active Directory, and the default user(Admin) for my Azure account. Is it fine this way ? or does it require a new custom Azure AD and a separate tenant for performing client credential flow
Below Image contains list of permissions I have applied in my app:
Hi, thank you for the link. I created mail store through my code and also created it using Spring Integration Mail, one after another. So when I removed one, I did not get error. Probably something unimportant.
Congrats on getting in working. A real mind bender Microsoft sent us on. If I may ask, where in the Azure GUI did you get the ORGANIZATION_ID from? Is this the same as the Directory Tenant ID in Azure Application GUI?
Still can't get it to work. When executing the command "Get-ServicePrincipal -Organization <ORGANIZATION_ID> | fl" the serviceId outputted is the same value as OBJECT_ID in the New-ServicePrincipal command, which happens to be equals to Object ID field in the Azure application Overview. Is this correct? From your description, the serviceId value from Get-ServicePrincipal should be different to OBJECT_ID but in my case, they it is the same.
Not that you mentioned it, it looks like I saw wrong. ServiceId is the same as one that I used. But I used ObjectId from Enterprise Application View, instead of App Registration view.
I used that object ID for creating new principal and for adding mail box permission.
I will retry everything again, to be sure and I will get back to you.
This took me back to the documentation to register the service principal in exchange. I was using the registered app's objectId in the New-Service-Principal and Add-MailBox-Permission cmdlets. I changed that to AAD Enterprise Applications's objectId in both commands. With that i'm able to authenticate and read mail from INBOX. The documentation is very confusing in terms of service principal identifier. The documentation says service principal identifier in the Add-MailBox-Permissions is different from the previous one. In my case both are same, which is the Enterprise Application's ObjectId. Thanks a lot for pointing this out. I have been stuck on this for days, now everything is working smoothly :)
Perfect. Working for me too! Thanks for the suggestion to use Enterprise Application View. I was using the object Id from the App Registration section.
@borist2 Thank you for pointing out this clue where we need to use OBJECT ID from the Enterprise application view in all the cmdlets i.e. New-ServicePrincipal, Get-ServicePrincipal and Add-MailboxPermission. It is finally working fine (only for IMAP flow) for me after trying out the same set of steps on a new application, keeping in mind that I have to use OBJECT ID value from Enterprise Application view.
But still there is some issue while trying to connect with this application for POP3 flow.
As per my understanding, following is the list of parameters used while performing Service Principal related queries:
(Please correct me if I am wrong)
Parameters used (and where to find them):
appId: Application (client) ID [ found in Application Overview screen, from both Enterprise and App reg]
entObjId: Object ID(Enterprise app) [ found in Enterprise Application Overview screen only ]
orgId: Directory (tenant) ID [ found in Azure AD overview screen ]
In Add-MailboxPermission cmdlet, <SERVICE_PRINCIPAL_ID> creates confusion, because in order to apply permissions like "IMAP.AccessAsApp", the internet tells that "Service Principal ID" can be found at [ Azure AD -> Enterprise Application -> (chosen application) -> Permissions -> IMAP.AccessAsApp -> use the Service Principal ID from Flyout menu ]
Enterprise Object ID can be used in place of Organization ID in all 3 cmdlets
However I am still unable to establish a connection through the POP3 protocol, and I want to do it just like we did it for IMAP. Below is the error log for the issue I am facing while trying to connect with POP3. Any help and suggestions will be much appreciated.
@DestryHines Thanks for pointing this out. For me, this command is executed internally from the JavaMail library functions. After reviewing your comment I tried to split the command into 2 lines using the property, "mail.pop3.auth.xoauth2.two.line.authentication.format" as true
But I am still unable to establish a connection with POP3 protocol. And getting the same error message.
Note: Updated the POP3 code in this post
@jambo Thank you for suggesting me to apply this property. I have tried to implement it in my existing code but I haven't got any success in establishing a connection through POP3.
Apart from this property, I tried setting:-
mail.pop3.auth.xoauth2.disable as false
mail.pop3.auth.mechanisms as XOAUTH2
mail.pop3.starttls.enable as true
Please let me know if any other parameters are required, or an existing parameter needs to be removed.
I'm not using Java but I'm having a similar problem in PHP using a third-party library called PHPMailer with SMTP now. I think most implementations didn't properly support client_crendentials for the grant type because Microsoft didn't have it working properly. You may need to get an updated version or figure out in your Java code how it's handling the oAuth grant type and update the code until there's an update.
I have been using JavaMail jar 1.5.5 all this time, so I tried to update it to 1.6.2(latest). I have checked the msal4j jar, which have version 1.12.0(released on May 06, 2022), seems fine. Post updating the jars I ran the flow for POP3 connection again, but didn't got any success till now.
I got the same thing after I finally fixed all the other issues and the next day it went away. Seems to be related to too many failed logins in this case.
I'm having a similar problem, where a long running process must have access to send emails using @outlook.com on user's behalf. After spending a couple days I found this small paragraph in the docs:
According to one of the Exchange engineers oAuth SMTP isn't supported yet. From what I've read it will never be enforced because devices like Printers that send SMTP cannot be updated to support oAuth SMTP. When it's finally supported, we can change the code to use it but don't really need to for most situations.
I am also having similar issue and spent significant amount of time in searching for proper solution. Can you provide the steps that you followed in setting up the app to resolve the issue. I really appreciate your help.
I had a similar problem with POP3 with the latest version of javax.mail (1.6.2)
However, I was looking at the documentation and the project move to jakarta mail. I replaced project dependency with jakarta.mail 1.6.7 and POP3 started to work.
