MMEmail: My First Clojure Open Source Contribution

MMEmail: My First Clojure Open Source Contribution

Micah Martin
Micah Martin

April 21, 2010

While working on website for my sister, I was perturbed that there were no libraries on Clojars for sending email. I was using Leiningen which will download and include all your dependancies for you (so sweet!).

MMEmail, My first Clojure Open Source Contribution.

Yet, with the library I found, I had to manually download all the required jars. Call me lazy but being forced to manually download dependancies seems like cruel and unusual punishment these days.

So I solved the problem with MMEmail: Simple Clojure library for sending email, with just one jar!



2(defproject your-project "0.0.0"
3 :dependencies [[mmemail "1.0.0"]]

Jar File

Can be downloaded at


Include the library:

1(use 'mmemail.core)

The Easy Way

mmemail.core is the only include you need. It contains only 2 methods, the fist being send-email. It takes a map that includes all the configuration and email parameters. That’s it.

1(send-email {:host ""
2 :port 465
3 :ssl true
4 :user ""
5 :password "runner"
6 :to ""
7 :subject "Greetings"
8 :body "Meep Meep!"})

Most of the parameters are required, but based on your server configuration you might get away without these:

  • :ssl
  • :password
  • :subject

It also accepts the following optional parameters:

  • :from (defaults to :user)
  • :cc
  • :bcc

The recipient parameters (:to, :cc, :bcc) may be a string, for one recipient, or a sequence of strings, for multiple recipients.

The Convenient Way

It can be annoying to pass such a big map into the function, and typically you’ll want to get all the server configuration out of the way. This is where the second function of mmemail.core (create-mailer) comes into play.

1(def my_mailer (create-mailer {:host ""
2 :port 465
3 :ssl true
4 :user ""
5 :password "runner"}))

Create-mailer will return a new function with all the configuration baked in. So in the future, you can send email like so:

1(my_mailer {:to ""
2 :subject "Greetings"
3 :body "Meep Meep!"})

The create-mailer accepts email parameters that will be used as defaults when the generated function is called.

1(def my_mailer (create-mailer {:subject "Greetings"
2 :body "Meep Meep!"
3 :host ""
4 :port 465
5 :ssl true
6 :user ""
7 :password "runner"}))
8(my_mailer {:to ""})


Copyright 2010 Micah Martin. All Rights Reserved. MMEmail and all included source files are distributed under terms of the GNU LGPL.