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[英]Can not change the display name of From email through smtp.office365.com using C# SmtpClient
[英]Unable to send email from Office 365 using c# SmtpClient
尝试使用 SmtpClient 从我在 c# 中的 winforms 应用程序发送电子邮件。 通过这篇 MS 文章,它应该可以工作。 我搜索了许多论坛等,但没有找到任何解决方案。 该错误消息似乎表明客户端未通过身份验证。 密码是正确的,我已经以这个用户的身份登录了密码,没问题。 2FA 已开启,但 htis 不应该妨碍它吗?
我检查过的东西都到位了
代码
var userName = "user@domain.onmicrosoft.com";
var password = "password";
var msg = new MailMessage();
msg.To.Add(new MailAddress("user@gmail.com"));
msg.From = new MailAddress(userName);
msg.Subject = "Test Office 365 Account";
msg.Body = "Testing email using Office 365 account.";
msg.IsBodyHtml = true;
var client = new SmtpClient{
Host = "smtp.office365.com",
Credentials = new System.Net.NetworkCredential(userName, password),
Port = 587,
DeliveryMethod = SmtpDeliveryMethod.Network,
EnableSsl = true
};
client.Send(msg);
例外
MAIL KIT 实现(建议 vasily.sib)
var message = new MimeMessage();
message.From.Add(new MailboxAddress("Test User", "user@domain.onmicrosoft.com"));
message.To.Add(new MailboxAddress("Gmail User", "testuser@gmail.com"));
message.Subject = "test";
message.Body = new TextPart("plain")
{
Text = @"test"
};
var client = new SmtpClient(new ProtocolLogger("imap.log"));
// For demo-purposes, accept all SSL certificates (in case the server supports STARTTLS)
client.ServerCertificateValidationCallback = (s, c, h, e) => true;
client.Connect("smtp.office365.com", 587, SecureSocketOptions.Auto); //this is fine and it connects
var clientAuthenticationMechanisms = client.AuthenticationMechanisms;
client.AuthenticationMechanisms.Remove("XOAUTH2");
// Note: only needed if the SMTP server requires authentication
client.Authenticate("user@domain.onmicrosoft.com", "password"); // this is where it fails with Authentication Failure
client.Send(message);
client.Disconnect(true);
邮件套件日志输出
Connected to smtp://smtp.office365.com:587/?starttls=when-available
S: 220 SYCP282CA0015.outlook.office365.com Microsoft ESMTP MAIL Service ready at Mon, 25 Nov 2019 04:49:36 +0000
C: EHLO [192.168.2.50]
S: 250-SYCP282CA0015.outlook.office365.com Hello [58.6.92.82]
S: 250-SIZE 157286400
S: 250-PIPELINING
S: 250-DSN
S: 250-ENHANCEDSTATUSCODES
S: 250-STARTTLS
S: 250-8BITMIME
S: 250-BINARYMIME
S: 250-CHUNKING
S: 250 SMTPUTF8
C: STARTTLS
S: 220 2.0.0 SMTP server ready
C: EHLO [192.168.2.50]
S: 250-SYCP282CA0015.outlook.office365.com Hello [58.6.92.82]
S: 250-SIZE 157286400
S: 250-PIPELINING
S: 250-DSN
S: 250-ENHANCEDSTATUSCODES
S: 250-AUTH LOGIN XOAUTH2
S: 250-8BITMIME
S: 250-BINARYMIME
S: 250-CHUNKING
S: 250 SMTPUTF8
C: AUTH LOGIN
REMOVED BASE64 DATA (password, login)
S: 535 5.7.3 Authentication unsuccessful [SYCP282CA0015.AUSP282.PROD.OUTLOOK.COM]
解决了。 正是 2FA 阻止了它的发生。 关掉它,它起作用了
我今天遇到了同样的问题。 Office365 也需要 TLS 连接。 因此,您应该将以下代码添加到您的代码中
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
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