通过vb.net发送邮件时出错 [英] Error in sending mail through vb.net

问题描述

System.Net.Mail.SmtpException：SMTP服务器需要安全连接，或者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。在System.Net.Mail.SmtpTransport的System.Net.Mail.MailCommand.Send（SmtpConnection conn，Byte []命令，String from）的System.Net.Mail.MailCommand.CheckResponse（SmtpStatusCode statusCode，String response）上了解更多信息。位于_Default.Button1_Click（对象发件人，EventArgs e）的System.Net.Mail.SmtpClient.Send（MailMessage消息）的.SendMail（MailAddress发件人，MailAddressCollection收件人，String deliveryNotify，SmtpFailedRecipientException& exception）



当我尝试在server.else上发送邮件时，我遇到同样的错误，当我在本地机器上编译并执行相同的代码时，它工作正常。下面是发送消息的代码。

尝试
 Dim Smtp_Server As New SmtpClient 
 Dim e_mail As New MailMessage（）
 Smtp_Server .UseDefaultCredentials = False 
 Smtp_Server.Credentials = New Net.NetworkCredential（  [e-mail]，  *********）
 Smtp_Server.Port =  587  
 Smtp_Server.EnableSsl = False 
 Smtp_Server.Host =   smtp.gmail.com 
 
 e_mail = New MailMessage（）
 e_mail.From = New MailAddress（  [e-mail]）
 e_mail.To.Add（   surjiti [e-mail]）
 e_mail.Subject =  查询来自 + txtname.Text 
 e_mail.IsBodyHtml = False 
 e_mail.Body =  名称：  + txtname.Text +  ，电子邮件ID： + txtEmail.Text +  ，学院名称： + txtCollegename.Text +  ，手机号码： + txtMobile.Text +  ，查询： + txtComment.Text 
 
 Smtp_Server.Send（e_mail）
 
 Label5.Visible = True 
 txtCollegename.Text =   
 txtComment.Text =  <跨度class =code-string> 
 txtEmail.Text =   
 txtMobile.Text =   
 txtname.Text =   
 Catch error_t As Exception 
 Label5.Visible = True 
 Label5。 Text = error_t.ToString 
 
结束尝试

解决方案

错误说明了一切......

Quote：

SMTP服务器需要安全连接或客户端未经过身份验证。

您应该 EnableSsl = True 而不是 False ，因为 Gmail 适用于 SSL 。



执行此操作后，代码应该可以正常工作。否则，请确保用于连接 Gmail 的凭据是正确的。



如需完整的工作代码，请参阅我过去的答案 - 从asp.net发送电子邮件至gmail [< a href =http://www.codeproject.com/Answers/321575/sending-email-to-gmail-from-asp-net#answer3target =_ blanktitle =New Window> ^ ]。

System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at _Default.Button1_Click(Object sender, EventArgs e)

I am facing the same error when I try to send the mail on server.else when I compile and execute the same code on local machine then it's working fine. below are the code for sending message.

Try
            Dim Smtp_Server As New SmtpClient
            Dim e_mail As New MailMessage()
            Smtp_Server.UseDefaultCredentials = False
            Smtp_Server.Credentials = New Net.NetworkCredential("[e-mail]", "*********")
            Smtp_Server.Port = 587
            Smtp_Server.EnableSsl = False
            Smtp_Server.Host = "smtp.gmail.com"

            e_mail = New MailMessage()
            e_mail.From = New MailAddress("[e-mail]")
            e_mail.To.Add("[e-mail]")
            e_mail.Subject = "Query From" + txtname.Text
            e_mail.IsBodyHtml = False
            e_mail.Body = "Name :" + txtname.Text + ", EMail ID :" + txtEmail.Text + ", College Name :" + txtCollegename.Text + ", Mobile Number :" + txtMobile.Text + ", Query :" + txtComment.Text

            Smtp_Server.Send(e_mail)

            Label5.Visible = True
            txtCollegename.Text = ""
            txtComment.Text = ""
            txtEmail.Text = ""
            txtMobile.Text = ""
            txtname.Text = ""
        Catch error_t As Exception
            Label5.Visible = True
            Label5.Text = error_t.ToString

        End Try

解决方案

Error says it all...

Quote:

The SMTP server requires a secure connection or the client was not authenticated.

You should have EnableSsl = True instead of False, because Gmail works on SSL.

After doing this, the code should work. Otherwise make sure that credentials, which is used to connect to Gmail are correct.

For a full working code, see my past answer - sending email to gmail from asp.net[^].

这篇关于通过vb.net发送邮件时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！