System.Net.Mail发送超时

Question

我有一些旧的代码可以很好地发送电子邮件，但visual studio告诉我代码已经过时，我应该从Web.Mail更改为Net.Mail。我重写了大部分内容，但我有几个问题。

这里原来，工作代码：

public void Send(string from, string to, string subject, string body, bool isHtml, string[] attachments) 
{ 

    var mailMessage = new MailMessage 

    { 
     From = from, 
     To = to, 
     Subject = subject, 
     Body = body, 
     BodyFormat = isHtml ? MailFormat.Html : MailFormat.Text 
    }; 


    // Add attachments 
    if (attachments != null) 
    { 
     foreach (var t in attachments) 
     { 
      mailMessage.Attachments.Add(new Attachment(t)); 
     } 
    } 
    mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", 1); 
    mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", _accountName); 
    mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", _password); 
    mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport", _port.ToString(CultureInfo.InvariantCulture)); 
    mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", true); 

    SmtpMail.SmtpServer = _smtp; 
    SmtpMail.Send(mailMessage); 
} 

，这里是重写的部分（嗯，差不多）

public void Send2(string from, string to, string subject, string body, bool isHtml, string[] attachments) 
{ 
var fromObj = new MailAddress(from); 
var toObj = new MailAddress(to); 


var mailMessage = new System.Net.Mail.MailMessage 
         { 
          From = fromObj, 
          Subject = subject, 
          Body = body, 
          IsBodyHtml = isHtml, 
         }; 

mailMessage.To.Add(toObj); 

if (attachments != null) 
{ 
    foreach(var t in attachments) 
    { 
     mailMessage.Attachments.Add(new Attachment(t)); 
    } 
} 

var smtp = new SmtpClient(_smtp) {Credentials = new NetworkCredential(_accountName, _password), Port = _port, EnableSsl = true}; 
smtp.Send(mailMessage); 
} 

如果你想知道，我有_port和_smtp分别在代码465和smtp.gmail.com中设置更高的值。

所以它似乎工作，但随后下到发送方和吐出的其中之一：

System.Net.Mail.SmtpException: The operation has timed out. 

有我丢失的东西，像从原代码Fields，即导致它超时？

谢谢！

SOLUTION

由于DavidH的方向是正确的点，端口需要从改为（或25;我使用的是前者没有问题）。

Answer 1

有点Google走了很长的路。检查这个答案你的治疗 - 你使用错误的端口：

https://stackoverflow.com/a/11244548/2420979