SmtpD

Implementation of a basic SMTP daemon in various languages and platforms.

I created this project as an exercise in polyglot programming and to test the performance of various frameworks. A lot of inspiration for this project came from HelloD.

All implementations have roughly the same functionality, which is at the "hello world" level. They listen on all interfaces for connections on port 2525 and blackhole incoming emails. For a more complete implementation of an SMTP server, you need to look for other open source projects.

Running

Erlang

cd erlang
./compile
./start
1> application:start(smtpd).

Go

cd go
gomake
./smtpd

Java - Netty

cd java-netty
./compile
./smtpd

JRuby - Netty

cd jruby-netty
jruby smtp_server.rb

Node

cd node
node smtpd.js

Ruby - Cool.io

cd ruby-coolio
bundle
ruby smtpd.rb

Ruby - EventMachine

cd ruby-em
bundle
ruby smtpd.rb

Ruby - Celluloid evented

cd ruby-cell-ev
bundle
jruby --1.9 smtpd.rb

Ruby - Celluloid threaded

cd ruby-cell-th
bundle
jruby --1.9 smtpd.rb

Performance testing

Performance testing with smtpsource. This program is distributed with Postfix.

time smtp-source -c -d -l 32000 -m 10000 -N -s 30 127.0.0.1:2525

See results.md for test results from my MacBook Pro with 2.2 GHz Intel Core i7.