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I am trying to use Java Mail to connect to an IMAP server using XOAUTH2. The configuration is as follows:

Properties properties= new Properties();
properties.put("mail.imap.ssl.enable", "true");
properties.put("mail.imap.auth.mechanisms", "XOAUTH2");
properties.put("mail.imap.auth.login.disable", true);
properties.put("mail.imap.auth.plain.disable", true);
properties.put("mail.imap.auth.xoauth2.disable", false);
properties.put("mail.debug", "true");
properties.put("mail.debug.auth", "true");
                
Session session = Session.getInstance(properties);
store = session.getStore("imaps");
store.connect(host, username, accessToken);

As you can see, I am using all the properties to avoid any connection using another mechanism different than XOAUTH2, but the debug shows that AUTHENTICATE PLAIN is used instead of AUTHENTICATE XOAUTH2:

enter image description here

The dependency used in POM is the following:

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.6.2</version>
</dependency>

Finally, I can authenticate using openssl directly by using AUTHENTICATE XOAUTH2:

enter image description here

What I am doing wrong? How can I make Java Mail uses the command AUTHENTICATE XOAUTH2 instead of AUTHENTICATE PLAIN?

Thanks

Jucaalpa
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  • Looks like what you have should work... That said, is it important which authentication mechanism you use? PLAIN AUTH is fine once the connection is over ssl. – Robert Nov 01 '22 at 20:02
  • It seems that the IMAP server works only with XOAUTH2 mechanism. With PLAIN AUTH the authentication fails. – Jucaalpa Nov 01 '22 at 20:52

1 Answers1

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After several hours of working on this, I found that the problem is with the name of the IMAP properties. I changed properties to the following, and now it works:

properties.put("mail.imaps.sasl.mechanisms", "XOAUTH2");

Note that it is not "imap" but "imaps" with an "s" at the end.

I don't know why in many questions in Stackoverflow and the Java Mail documentation the properties appear without the "s" and apparently, it works for them.

enter image description here

https://javaee.github.io/javamail/docs/api/com/sun/mail/imap/package-summary.html

Be aware to use a Java Mail Version equal or superior to 1.5.2. I used Java Mail 1.6.2.

Hope this can help somebody else.

Jucaalpa
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