使用C發送郵件時出錯＃

Question

我在C＃中創建了一個郵件發送器，但是程序在運行時會出錯。

這是我的代碼：

MailMessage mail=new MailMessage("shahidi83am@gmail.com","shahidi83am@yahoo.com","subject","this is a test"); 
     SmtpClient smtp =new SmtpClient("smtp.gmail.com"); 
     smtp.Port=587; 
     smtp.Credentials= new System.Net.NetworkCredential("username","pass"); 
     smtp.Send(mail); 

，這是錯誤：

System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. 79sm6578238wrc.34 - gsmtp

Answer 1

是用戶名和通在下面的線原始字符串？那麼會發生錯誤。

smtp.Credentials= new System.Net.NetworkCredential("username","pass"); 

在的NetworkCredential你必須提供發件人的電子郵件和密碼。

例如：

string username = "abc@example.com"; 
string pass = "whatever_your_password_is"; 
smtp.Credentials= new System.Net.NetworkCredential(username,pass); 

Answer 2

我使用Gmail這些參數;

SmtpClient smtpClient = new SmtpClient(); 
smtpClient.Host = "smtp.gmail.com"; 
smtpClient.Port = 587; 
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network; 
smtpClient.EnableSsl = true; 
smtpClient.UseDefaultCredentials = false; 
smtpClient.Credentials = new NetworkCredential(smtp_user, smtp_pass); 
smtpClient.Send(message);