Question

自己编写的C# winForm邮件发送程序发送邮件失败？

是不是在发送之前要配制什么东东。代码由下：
//发送按钮的单击事件
private void btn_Begin_Click(object sender, EventArgs e)
{
string from= txt_from.Text.Trim();//发送账号

string psd = txt_from_psd.Text.Trim();//密码

string to = txt_to.Text.Trim();//收件账号

string title = txt_title.Text;

string content = txt_content.Text;

string[] fasong = from.Split('@');

string[] fs = fasong[1].Split('.');

//发送

SmtpClient client = new SmtpClient("smtp." + fs[0].ToString() + ".com"); //设置邮件协议

client.UseDefaultCredentials = false;//

client.DeliveryMethod = SmtpDeliveryMethod.Network; //通过网络发送到Smtp服务器

client.Credentials = new NetworkCredential(fasong[0].ToString(), psd); //通过用户名和密码 认证

MailMessage mmsg = new MailMessage(new MailAddress(from), new MailAddress(to)); //发件人和收件人的邮箱地址

mmsg.Subject = title; //邮件主题

mmsg.SubjectEncoding = Encoding.UTF8; //主题编码

mmsg.Body = content; //邮件正文

mmsg.BodyEncoding = Encoding.UTF8; //正文编码

mmsg.IsBodyHtml = true; //设置为HTML格式

mmsg.Priority = MailPriority.High; //优先级

try
{

client.Send(mmsg);

MessageBox.Show("邮件已发成功");

}

catch (Exception ex)
{

MessageBox.Show(ex.Message);

}

}
}
}
我是用sina邮件测试发送的，但还是发送失败。哪位大哥能告诉我，我第二次补充了，哪位大哥能帮忙解知之一下。

Answer 1

界面就不画了，大概的你看一下控件就知道，我这样实验过时成功的呀，对了，不要使用163的邮箱作为发送方，这个会有问题的！

protected void btnSend_Click(object sender, EventArgs e)
{

SmtpClient client = new SmtpClient();
//这个地方的用户名你可以用split从发送人中截取
client.Credentials = new System.Net.NetworkCredential("ggyy-0516", txtPwd.Text);
client.Port = 25;
client.Host = "smtp.126.com";
try
{
client.Send(Initial(txtAddr.Text.ToString()));
ClientScript.RegisterStartupScript(this.GetType(), "myScript", "<script>alert('发送成功!')</script>");
}
catch(System.Net.Mail.SmtpException ex)
{
ClientScript.RegisterStartupScript(this.GetType(), "myScript",
"<script>alert('"+ex.Message.ToString()+"')</script>");
}
}

public MailMessage Initial(string Address)
{
MailMessage m_Mail = new MailMessage();
//发件人
m_Mail.From = new MailAddress(txtSend.Text.Trim());
//收件人
m_Mail.To.Add(new MailAddress(Address));
//主题
m_Mail.Subject = txtTopic.Text;
//内容
m_Mail.Body = txtContent.Text;
//邮件主题和正文编码格式
m_Mail.SubjectEncoding = System.Text.Encoding.UTF8;
m_Mail.BodyEncoding = System.Text.Encoding.UTF8;
//邮件正文是Html编码
m_Mail.IsBodyHtml = true;
//优先级
m_Mail.Priority = System.Net.Mail.MailPriority.High;
//添加附件,可以添加多个
m_Mail.Attachments.Add(new Attachment("f:\\1.txt"));
//密件抄送收件人
m_Mail.Bcc.Add(Address);
//抄送收件人
m_Mail.CC.Add(Address);

return m_Mail;
}

Answer 2

估计不是你代码问题，要么防火墙问题，要么你的邮箱根本不支持smtp服务。你先验证你邮箱的smtp可用。例如你使用126，几年前的126邮箱可以smtp，现在申请的smtp被封了。

你用下面的写法看看好不好用：
try
{
SmtpClient smtp = new SmtpClient();
smtp.Host = hostTextBox.Text;

if (isAuthCheckBox.Checked)
{
CredentialCache myCache = new CredentialCache();
myCache.Add(hostTextBox.Text, 25, "login", new NetworkCredential(userNameTextBox.Text, passwordTextBox.Text));
smtp.Credentials = myCache;
}

MailMessage message = new MailMessage();
message.Subject = subjectTextBox.Text;
message.Body = bodyTextBox.Text;
message.From = new MailAddress(fromTextBox.Text);

foreach (String to in toTextBox.Text.Split(';'))
{
message.To.Add(to);
}

smtp.Send(message);
MessageBox.Show("No Error");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

Answer 3

public void MailSend(String sendTo,String subject,String body)
{
try
{
MailAddress sendfrom = new MailAddress(Common.Class1.sendFromAddress);
MailAddress sendto1 = new MailAddress(sendTo);
MailMessage message = new MailMessage();
message.From = sendfrom;
message.To.Add(sendto1);
message.Subject = subject;
//message.IsBodyHtml = true;
message.Body = body;
SmtpClient sc = new SmtpClient(new String("SMTP服务器地址"));//发送邮件用到的smtp主机(用不同的邮箱，smtp定义则不同)
sc.Credentials = new System.Net.NetworkCredential(new String("邮箱名"), new String("密码"));//邮箱账号与密码
sc.Send(message);//发送邮件
}
catch (SmtpException se)
{
throw new System.Exception(se.ToString());
}
}

Answer 4

126的smtp跟pop是需要申请开通的，你网页登入后设置里能找到选项