How to create smtp server for sending mail from desktop application?

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C#

WinForms

C#4.0

How to create smtp server in an easy for sending mail from desktop?
Thanks in Advance...

Posted 12-Feb-15 19:50pm

Ghanshyam Vadher

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Sergey Alexandrovich Kryukov 13-Feb-15 2:56am

You can, but why? How about using some existing SMTP server?
Are you sure you really want to create a server? If you need to send mail, this is not what you would need.
—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-02-12T21:06:00

If you look at SMTP protocol, you will see that this is the application-level protocol, right on top of transport-layer TCP:
http://en.wikipedia.org/wiki/Application_layer[^],
http://en.wikipedia.org/wiki/Transport_layer[^],
http://en.wikipedia.org/wiki/Transmission_Control_Protocol[^].

Therefore, keeping in mind that TCP is fully available from .NET FCL, you have to implement SMTP based on TCP. You don't have to use raw sockets, you can use more convenient TcpListener. Please see:
https://msdn.microsoft.com/en-us/library/system.net.sockets.tcplistener%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.net.sockets.socket(v=vs.110).aspx[^],
https://msdn.microsoft.com/en-us/library/System.Net.Sockets%28v=vs.110%29.aspx[^].

The protocol itself is completely described in the RFC standard IETF documents referenced here: http://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol[^].

But… why? And where would you host your server? Why not using something already existing and operational?

—SA