Check and verify that a smtp-server is up and running?

Question

Hey there.
I have an application in C#, that is depending on the fact that a smtp-server is valid and running.
Is there any way of checking if a given smtp-server is "alive"?

SmtpClient smtpclient = New SmtpClient(<server>);

/Kristian

 

Answer 1

You can try to handshake with the Smtp server, it the handshake could be done everything is running normally.

Take a look at the Smtp protocol how to implement an handshake or take a look at the following article that demostrates how to then email with C#. It implements all commands and you can just pickout the handshake process: Sending email with c# using SMTP Servers.

Answer 2

Thanks.
The following solved it:

using System.Net.Sockets; public bool Handshake() {    Try    {       TcpClient tcp = New TcpClient();       tcp.Connect(<smtpHost>, 25);       return true;    }    Catch (Exception myException)    {       return false;    } }