通过SMTP客户端发送电子邮件时出错

Question

这可能对你来说非常微不足道,但我无法弄清楚为什么我在运行我的代码时收到此错误消息.我查看了同一网站上的一些相关问题,例如 通过带有C#的Gmail SMTP服务器发送电子邮件, 但没有一个是有帮助的.有人愿意帮忙吗？使用不同的组件也是可以接受的 所以如果有人得到一个可以理解的工作解决方案.

错误消息= SMTP服务器需要安全连接或客户端未经过身份验证.服务器响应为:5.5.1需要身份验证.了解更多信息

这是我的代码

System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();      
message.From = new MailAddress("bob@googlemail.com");
message.To.Add("bob@hotmail.com");
message.Subject = "Hello";
message.Body = "Hello Bob ";
message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 587);
smtpClient.EnableSsl = true;
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = new NetworkCredential("MyGoogleMailAccount", 
                                               "mygooglemailpassword");

smtpClient.Send(message.From.ToString(), message.To.ToString(), 
                message.Subject, message.Body);   

Answer 1

除了电子邮件地址之外,我认为您的代码没有任何问题.我使用此代码成功地将电子邮件从gmail发送到我的个人帐户(实际上是在LINQPad中运行).只需将3个字符串值替换为您帐户的有效值,您就应该去:

MailMessage message = new System.Net.Mail.MailMessage(); 
string fromEmail = "myaddr@gmail.com";
string fromPW = "mypw";
string toEmail = "recipient@receiver.com";
message.From = new MailAddress(fromEmail);
message.To.Add(toEmail);
message.Subject = "Hello";
message.Body = "Hello Bob ";
message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

using(SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 587))
{
    smtpClient.EnableSsl = true;
    smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
    smtpClient.UseDefaultCredentials = false;
    smtpClient.Credentials = new NetworkCredential(fromEmail, fromPW);

    smtpClient.Send(message.From.ToString(), message.To.ToString(), 
                    message.Subject, message.Body);   
}