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Editorial Team
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Asked: 2026-05-28T07:06:57+00:00

i am creating an email client that sends e-mail address from server ip instead

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i am creating an email client that sends e-mail address from server ip instead of SMTP , i wrote the following code:

SmtpClient server = new SmtpClient();
server.Host= "50.23.128.66";
server.Port = 25;
server.Send("from@yahoo.com", "to@yahoo.com", "hi", "hope it works");

but when i run it, i get that error:

Unhandled Exception: System.Net.Mail.SmtpException: Service not
available, closing transmission channel. The server response was:
Cannot connect to SMTP server
50.23.128.66 (50.23.128.66:25), connect error 10061

i actually think that port is wrong . * By the way i am using Windows Server 2008 *

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1 Answer

  1. Editorial Team

    I think “connect error 10061” is the same as errno == ECONNREFUSED on a POSIX platform, which means the connection did not succeed, probably because the host you tried to connect to isn’t running any sort of server on port 25.

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