尝试使用SmtpClient从我的WinForms应用程序中发送电子邮件。根据这篇MS article,应该可以工作。我在许多论坛等地方搜索了很久,但没有找到任何解决方案。错误消息似乎表明客户端未经身份验证。密码是正确的,我已经使用此用户登录并输入密码,一切正常。2FA已启用,但它不会妨碍,对吧?
我已经检查了以下事项:
我已经检查了以下事项:
- 启用SSL
- 发件人和收件人电子邮件相同
- 端口587
- 我在Outlook中有此帐户,并且可以正常发送
- 防火墙未阻止此端口。我有其他代码使用完全相同的代码与非O365主机一起使用,它可以正常工作
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);
异常
- SMTP服务器需要安全连接或客户端未经身份验证。服务器响应为:5.7.57 SMTP;客户端未经身份验证发送匿名邮件的MAIL FROM。
邮件工具包实现(vasily.sib的建议)
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]