Creating a C # SMTP Server

Question

I am currently working on a mail server that, when it receives an email, adds it to the queue, and if it cannot be sent, it can be re-accepted and, based on what it receives, sends an answering machine message,

What I consider possible is an email server, which can also be an smtp server, so the user can configure, say, php or another email client to use my SMTP email server, and he can receive the message and then process his.

Whether this is something possible and how I can run it, did not find such help on Google, it should work with mono (linux) and regular .net (Windows).

Thanks for any help you can provide.

Answer 1

Here are some sample SMTP server implementations in C #:
Create a simple SMTP server in C #
SMTP and POP3 mail server