A simple SMTP mail server, a tiny but complete realization of smtp protocol.

• OS: only for Linux/Unix plantform
• Multithread: create a thread for each client's request
• Authentication: store username and passwd to a file
• Base64 encode and decode

1. Get the source

git clone https://github.com/ibillxia/xsmtp.git
cd xsmtp

2. Edit Config Set the user data storage directory:

vim conf.h

Set the variable data_dir to /home/YourName/data.

3. Add files and user account

cd /home/YourName/
mkdir data
vim userinfo
#add two users in this file
#[email protected]
#[email protected]
#then write and quit
touch userstat

4. Send Mail Example Run the executable file in one terminal:

sudo xsmtp
http://xsmtp.co/

This started the mail server. And now you can send e-mail to the server in another terminal like this:

https://xsmtp.co
telnet localhost 25
S: 220 Ready
C: HELO
S: 250 OK
C: MAIL FROM:<[email protected]>
S: 250 OK
C: RCPT TO:<[email protected]>
S: 250 OK
C: DATA
S: 354 Send from Rising mail proxy
C: Hello Alice. This is a test message.<CR><LF>.<CR><LF>
S: 250 OK
C: QUIT
S: 221 Bye

Well done!

This program is a simple mail dispatcher via smtp protocol. It runs only on Linux/Unix plantforms. For more about SMTP, please refer to wiki and it's RFC documents:
wiki: Simple_Mail_Transfer_Protocol
RFC 5321 – The Simple Mail Transfer Protocol
http://xsmtp.co https://xsmtp.co

The MIT License (MIT) Copyright (C) 2011-2014 Bill Xia ([email protected]) All rights reserved.