使用现代身份验证（OAuth）来连接POP、IMAP或SMTP

 HTTP

POST https://login.partner.microsoftonline.cn/{tenant ID}/oauth2/token HTTP 1.1  

Host: login.partner.microsoftonline.cn

Content-Type: application/x-www-form-urlencoded

client_id={App ID}

&client_secret={Client Secret}

&grant_type=password

&resource=https%3A%2F%2F2.gy-118.workers.dev/%3A443%2Fhttps%2Fpartner.outlook.cn

&username=user%40abc.com

&password={user password}

 cURL

curl -X POST -H "Content-Type: application/x-www-form-urlencoded" -d 'client_id={App ID}&resource=https%3A%2F%2F2.gy-118.workers.dev/%3A443%2Fhttps%2Fpartner.outlook.cn%2F.default&client_secret={Client Secret}&grant_type=password&username=user%40abc.com&password={user password}'  'https://login.partner.microsoftonline.cn/{tenant}/oauth2/token'    

 Text

base64("user=" + userName + "^Aauth=Bearer " + accessToken + "^A^A")    

 Text

base64("[email protected]^Aauth=Bearer eyJ0eXAiOiJKV1QiLCJub25jZSI6IjlBOGtWal9hcXpVOWAA^A^A")   

 Text

dXNlcj11c2VyQGFiYy5jb21eQWF1dGg9QmVhcmVyIGV5SjBlWEFpT2lKS1YxUWlMQ0p1YjI1alpTSTZJamxCT0d0V2FsOWhjWHBWT1dBQV5BXkE=   

 Text

AUTH XOAUTH2 

<base64 string in XOAUTH2 format>

 Text

AUTHENTICATE XOAUTH2 <base64 string in XOAUTH2 format>

 Text

AUTH XOAUTH2 <base64 string in XOAUTH2 format>

 C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Net;

using MailKit.Net.Smtp;

using MailKit.Security;

using MimeKit;

using MailKit;

namespace OAuth2forMail

{

    class Program

    {

        static void Main(string[] args)

        {

            var p = new Program();

            p.Sendmm();

        }

         void Sendmm()

        {

            MimeMessage mm = new MimeMessage();

            mm.To.Add(new MailboxAddress("My Customer", "[email protected]"));

            mm.From.Add(new MailboxAddress("Boss Wang", "[email protected]"));

            var builder = new BodyBuilder();

            builder.TextBody = @"This is a test mail.";

            mm.Subject = "Test to send mail with OAuth2";

            mm.Body = builder.ToMessageBody();

            SaslMechanismOAuth2 oauth2 = new SaslMechanismOAuth2("[email protected]",

                "eyJ0eXAiOiJKV1QiLCJub25jZSI6IjlBOGtWal9hcXpVOWAA"

                );

            using (var client = new SmtpClient(new ProtocolLogger("smtp.log")))

            {

                client.Connect("smtp.partner.outlook.cn", 587, SecureSocketOptions.StartTls);

                client.Authenticate(oauth2);

                try

                {

                     client.Send(mm);

                    Console.WriteLine("send success");

                    client.Disconnect(true);

                }

                catch (Exception ex)

                {

                    Console.WriteLine(ex.Message.ToString());

                }

            }

        }

    }

}