Sending mail with C#

Question

I set up my hMailServer on my windows 2008 machine, and I'm trying to send emails.

When I do it with C#

MailMessage message = new MailMessage(); message.From = new MailAddress(from, "John"); message.To.Add(new MailAddress(to)); message.Subject = subject; message.Body = body; SmtpClient client = new SmtpClient("mail.example.com"); client.Credentials = new System.Net.NetworkCredential("[email protected]", "password"); client.Send(message);

But when I try to send emails with a windows live email client, it gives me an error

The connection to the server has failed

All the settings are exactly the same. I tried several email clients, but it doesn't work. It never happened to me before. I just moved from one machine to another, and got this problem.

I can receive mail in the client though...

Can you try the Windows Live client from the server? Have you tried to telnet from your desktop to port 25? — Dave Swersky
– Dave Swersky, Commented Apr 7, 2010 at 16:38

Brian R. Bondy · Accepted Answer · 2010-04-07 16:37:33Z

3

Try to telnet to port 25, can it connect?

Open up command prompt:

telnet mail.example.com 25

If it cannot connect (which is what I expect) then you have a problem that is not code related but firewall related. (Or perhaps you're trying to connect to the wrong port if they're running SMTP on a non standard port)

answered Apr 7, 2010 at 16:37

Brian R. Bondy

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3 Comments

Alex Over a year ago

Yeah, I was able to send it from server's client. I'm installing telnet right now...

Alex Over a year ago

You are right. Connect failed. But even after turning off my anti virus and firewall, it still can't connect.

Brian R. Bondy Over a year ago

@Alex: From here you should post on serverfault.com, but you can see that it's not code related though.

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