JavaMail connecting to Office 365 XOAUTH2 for IMAP Authentication fails

New Contributor

Facing connectivity issue with Office365 online with OAuth2.0 I have set up the application permissions and IMAP and SMTP connection.Basic authentication seems to be work fine. I believe IMAP is enabled. My application is configured as Accounts in any organizational directory (Any Azure AD directory - Multitenant) and uses grant type authorization code.

And Delegated Microsoft Graph scopes https://graph.microsoft.com/IMAP.AccessAsUser.All have been added: Client scopes added

Requested Access token with resource as https://graph.microsoft.com

Successfully received access token with scopes as IMAP.AccessAsUser.All SMTP.Send

{
    "token_type": "Bearer",
    "scope": "IMAP.AccessAsUser.All SMTP.Send",
    "expires_in": 3599,
    "ext_expires_in": 3599,
    "access_token": "access_token",
    "refresh_token": "refresh_token",
    "id_token": "id_token"
} 

So here is the Java Code (JavaMail jar 1.6.2 used)

Properties properties= new Properties();
properties.put("mail.imap.ssl.enable", "true");
properties.put("mail.imap.auth.mechanisms", "XOAUTH2");
//properties.put("mail.imap.sasl.enable", "true"); un-commented still results are same
properties.put("mail.imap.auth.login.disable", "true");
properties.put("mail.imap.auth.plain.disable", "true");
properties.put("mail.debug", "true");
properties.put("mail.debug.auth", "true");

Session session = Session.getInstance(props);
session.setDebug(true);

String userEmail = "emailuser@domain.onmicrosoft.com";
String accessToken = "accessToken";

final Store store = session.getStore("imap");
store.connect("outlook.office365.com","993",userEmail, accessToken);

Following output :

DEBUG: JavaMail version 1.6.2
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: getProvider() returning javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle]
DEBUG IMAP: mail.imap.appendbuffersize: -1
DEBUG IMAP: mail.imap.minidletime: 10
DEBUG IMAP: closeFoldersOnStoreFailure
DEBUG IMAP: trying to connect to host "outlook.office365.com", port 993, isSSL true
* OK The Microsoft Exchange IMAP4 service is ready. [TQBB]
A0 CAPABILITY
* CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS ID UNSELECT CHILDREN IDLE 
NAMESPACE LITERAL+
A0 OK CAPABILITY completed.
DEBUG IMAP: AUTH: PLAIN
DEBUG IMAP: AUTH: XOAUTH2
DEBUG IMAP: protocolConnect login, host=outlook.office365.com, user=emailuser@domain.onmicrosoft.com, 
password=<non-null>
A1 AUTHENTICATE XOAUTH2 dXNlAQE=
A1 NO AUTHENTICATE failed.
Could not connect to the message store
javax.mail.AuthenticationFailedException: AUTHENTICATE failed.
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:731)
at javax.mail.Service.connect(Service.java:366)
at myproject.EmailReceiver.downloadEmails(EmailReceiver.java:79)
at myproject.EmailReceiver.main(EmailReceiver.java:179)

Following other posts could not able to find scopes https://outlook.office365.com/IMAP.AccessAsUser.All https://outlook.office365.com/SMTP.Send in my Azure. May be they are legacy scopes.

Is there any other scopes other then "https://graph.microsoft.com/IMAP.AccessAsUser.All" and "https://graph.microsoft.com/SMTP.send" required to connect to Exchange online through IMAP. Or any problem with existing code.

2 Replies

Can you tell me how to get to the accessToken?@VinyakPM 

@zoujg120820  Could I use the bearer token obtained in the method below for JavaMail connecting to Office 365 XOAUTH2  ?

shchoo83_0-1604982594263.png