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C# failed to send email by smtp.gmail.com (same code was working before)

whereismyid(到处找ID)

本文发表在 rolia.net 枫下论坛C# 2008 (From is my gmail account; Password is my gmail password)
..
// Send out emails
MailMessage message = new MailMessage();
message.From = new MailAddress(From.ToString());
message.To.Add(new MailAddress(To.ToString()));
message.Subject = Subject.ToString();
message.IsBodyHtml = true ;
message.Body = Body.ToString();

SmtpClient client = new SmtpClient();

client.EnableSsl = true; //also works for TLS protocol
client.Host = "smtp.gmail.com";
client.Port = 587;
client.Credentials = new NetworkCredential(From, Password);
try
{
client.Send(message);

return "";
}
catch (Exception exc)
{
return exc.ToString();
}
...

error message: can't connect remote server; target machine actually refuse....
any idea about that? Weird. this code was working almost 1 year.

Thanks更多精彩文章及讨论，请光临枫下论坛 rolia.net

(#4676640@0)
Last Updated: 2008-9-9
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工作学习 / 学科技术讨论 / C# failed to send email by smtp.gmail.com (same code was working before) -whereismyid(到处找ID); 2008-9-9 {1079} (#4676640@0)
本文发表在 rolia.net 枫下论坛C# 2008 (From is my gmail account; Password is my gmail password)
..
// Send out emails
MailMessage message = new MailMessage();
message.From = new MailAddress(From.ToString());
message.To.Add(new MailAddress(To.ToString()));
message.Subject = Subject.ToString();
message.IsBodyHtml = true ;
message.Body = Body.ToString();

SmtpClient client = new SmtpClient();

client.EnableSsl = true; //also works for TLS protocol
client.Host = "smtp.gmail.com";
client.Port = 587;
client.Credentials = new NetworkCredential(From, Password);
try
{
client.Send(message);

return "";
}
catch (Exception exc)
{
return exc.ToString();
}
...

error message: can't connect remote server; target machine actually refuse....
any idea about that? Weird. this code was working almost 1 year.

Thanks更多精彩文章及讨论，请光临枫下论坛 rolia.net

try "ping smtp.gmail.com" , what are you getting? try "telnet smtp.gmail.com 587", you should see something like 220 mx.google.com ESMTP -holdon(again); 2008-9-11 (#4681980@0)

can ping, but can't telnet smtp.gmail.com . thunderbird can work as usual from same gmail account. -whereismyid(到处找ID); 2008-9-11 (#4682556@0)

does thunderbird also use 587 port? If so, you probably has a firewall on your machine, which allow thunderbird but block telnet? -holdon(again); 2008-9-12 (#4683399@0)

Same 587. I checked firewall. It's ok there. But McAfee disallow telnet. I don't know how thunderbird can go through. So I fixed it by open McAfee. thanks for your analysis. -whereismyid(到处找ID); 2008-9-14 (#4687852@0)

ssl smtp port is 465 -googlebot(bot); 2008-9-14 (#4688411@0)

@Florida

C# failed to send email by smtp.gmail.com (same code was working before)

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