Send an email on Heroku with Node, ExpressJS, emailjs and SendGrid

SendGridMailer.coffee

#START:require
email = require 'emailjs'
#END:require

class SendGridMailer
  
#START:constructor
  constructor: (app) ->
    @settings = app.set 'smtpsettings'
#END:constructor

#START:sendEmail
  sendEmail: (to, cc, bcc, subject, plainText, html, fn) ->
   try 
     options =
       host: @settings.host
       port: @settings.port
       ssl: false
       user: @settings.username
       password: @settings.password
     
     headers = 
       to: to
       cc: cc
       bcc: bcc
       text: plainText
       subject: subject
       from: @settings.supportEmail
       reply_to: @settings.supportEmail

     server = email.server.connect options
     message = email.message.create headers
     message.attach_alternative html

     server.send message, (err, message) ->
       fn err, message
   catch error
     fn error
    
#END:sendEmail

#START:exports
module.exports = SendGridMailer
#END:exports

server.coffee

#START:imports
express = require 'express'
mailer = require './sendgrid_mailer'
#END:imports

class Server
#START:constructor
  constructor: (@port) ->
    @app = express.createServer express.logger()
    @configureApp()
    @configureRoutes()
    @emailer = new mailer @app
#END:constructor

#START:configureRoutes
  configureRoutes: ->

    @app.get '/', (request, response) ->
      response.render 'index.jade', {layout: true }
    
    @app.post '/', (request, response) =>
      to = request.params.mail.to
      cc = request.params.mail.cc
      bcc = request.params.mail.bcc
      subject = request.params.mail.subject
      plainText = request.params.mail.plainText
      html = request.params.mail.htmlText
      
      @emailer.sendEmail to, cc, bcc, subject, plainText, html, (err, result) ->
        console.log "error sending mail #{err}" if err?
        response.render 'index.jade', {layout: true, locals: {errorMessage: err, flashMessage: 'You email was sent'}}

#END:configureRoutes

#START:configureApp
  configureApp: ->
    app.use express.logger()
    app.use express.methodOverride()
    app.use express.bodyParser()

    smptSettings = 
      host: "smtp.sendgrid.net"
      port: 25
      password: process.env.SENDGRID_PASSWORD
      username: process.env.SENDGRID_USERNAME
        
    app.set 'smtpsettings', smptSettings
#END:configureApp

#START:start
  start: ->
    usedPort = @port
    @app.listen @port, -> console.log("Listening on " + usedPort)
#END:start

#START:exports
module.exports = Server
#END:exports