Java javax.mail、msal4j Oauth2 使用 Office 365 发送电子邮件

问：

我想发送电子邮件。我使用 Java 1.8、com.microsoft.aad.msal4j 和 javax.mail。 但是，我收到以下错误。无论我指定什么：

5.7.3 Authentication unsuccessful [........PROD.OUTLOOK.COM 2023-10-07T15:04:28.150Z ....]
Exception in thread "main" javax.mail.AuthenticationFailedException: 535 5.7.3 Authentication unsuccessful [........PROD.OUTLOOK.COM 2023-10-07T15:04:28.150Z ...]

at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:947)
at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:858)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:762)
at javax.mail.Service.connect(Service.java:366)

我已经试过了：1 2 3

不幸的是，您几乎找不到文档，并且此处的测试实现 4 也不好。

我使用：

    <dependency>
        <groupId>com.microsoft.azure</groupId>
        <artifactId>msal4j</artifactId>
        <version>1.13.10</version>
    </dependency>

虽然仅适用于 .default 或 https://outlook.office365.com/.default 作为范围，但对我有用。

这是我的实现（简短版本）：

    public static void main(String[] args) throws ExecutionException, InterruptedException, MessagingException, MalformedURLException {

    Properties props = new Properties();
    props.put("mail.smtp.port", "587");
    props.put("mail.smtp.host", "smtp.office365.com");
    props.put("mail.imap.ssl.enable", "true");
    props.put("mail.smtp.auth.mechanisms", "XOAUTH2");
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.starttls.required", "true");
    props.put("mail.debug.auth", "true");
    props.put("mail.debug", "true");
    props.put("mail.smtp.auth.xoauth2.disable", "false");
    props.put("mail.transport.protocol", "smtp");
    props.put("mail.smtp.auth.login.disable", "true");
    props.put("mail.smtp.auth.plain.disable", "true");

    Session session = Session.getInstance(props);

    Transport transport = session.getTransport("smtp");

    IAuthenticationResult t = tokenFor("https://outlook.office365.com/.default").get();
    String token = t.accessToken();

    transport.connect("smtp.office365.com", 587, "[email protected]", token);
    transport.send(new MimeMessage(session));
}

private static CompletableFuture<IAuthenticationResult> tokenFor(String... scopes) throws MalformedURLException {

    String tenantId = "...";
    String clientId = "...";
    String url = "https://login.microsoftonline.com/%s/oauth2/v2.0/token";

    String authority = String.format(url, tenantId);

    String clientSecret = "...";

    IClientCredential secret = ClientCredentialFactory.createFromSecret(clientSecret);

    ConfidentialClientApplication.Builder app = ConfidentialClientApplication.builder(clientId, secret)
            .authority(authority);

    ClientCredentialParameters.ClientCredentialParametersBuilder clientCredentialParam =
            ClientCredentialParameters.builder
                    (new HashSet<>(Arrays.asList(scopes)));

    return app.build().acquireToken(clientCredentialParam.build());
}

有人可以试试这个吗？