Forum: Ruby on Rails Heroku App Sending Blank Emails with Sendgrid

I'm a Rails newbie using version 3.1.4 for my Heroku (Cedar stack) app.
 I'm trying to figure out why my app is sending blank emails using
Sendgrid, and I haven't had much success with their support after 
raising a
ticket three business days ago, so I'm hoping someone here might be able 
to
help (tried searching the net and this group for blank emails, as well 
as
posting on Stackoverflow, too).

I'm connecting to Sendgrid OK because the emails are sending...they're 
just
blank (actually in hotmail the body says "This is a multi-part message 
in
MIME format...

----." and there's a small attachment in gmail that has that same text - 
in Yahoo mail it's blank though).


I followed these directions 
(https://devcenter.heroku.com/articles/sendgrid),
so I have:

my initializer/mail.rb

ActionMailer::Base.smtp_settings = {  :address        => 
'smtp.sendgrid.net',  :port           => '587',  :authentication => 
:plain,  :user_name      => ENV['SENDGRID_USERNAME'],  :password 
=> ENV['SENDGRID_PASSWORD'],  :domain         => 
'heroku.com'}ActionMailer::Base.delivery_method = :smtp


My mailer (notifier.rb), like this:
class Notifier < ActionMailer::Base

  helper :application
  default_url_options[:host] = "foo.com"

def registration_confirmation(user)
    from          'Foo <info@foo.com>'

    @user = user
    subject     "Welcome to Foo, #{@user.first_name}!"
    recipients  "#{@user.first_name} <#{@user.email}>"
    sent_on     Time.now
  end

a text version (registration_confirmation.text.erb and an html
version registration_confirmation.html.erb).

when I check the Heroku logs, it doesn't report any errors and it 
indicates
both views rendered successfully.  I have put the who output from the 
logs
in this gist: https://gist.github.com/2765790

If someone could please help this newbie learn what he's doing wrong, 
that
would be hugely appreciated.  Thank you!

Hey,

I'm Swift, one of the developer evangelists over at SendGrid. Sorry
that we didn't get back to you on our support channel - we get a high
volume of requests and sometimes things slip through the cracks.

Your problem is that you're using a deprecated syntax for composing
the email.  The preferred method is to use the mail function:

    def
registration_confirmation(user)
      mail(:from    => 'Foo
<info@foo.com>',
           :subject => "Welcome to Foo,
#{user.first_name}!",
           :to      => "#{user.first_name} <#{user.email}
>")
    end

You can find the docs for ActionMailer here:
http://guides.rubyonrails.org/action_mailer_basics.html

They're pretty extensive and definitely worth the read.

Let me know if you have any more issues!

- Swift