[Rails] actionmailer issues

[Nolan J. Darilek]

Thanks to those of you who assisted with my FAQ problem
yesterday. Using the form_tag helper resolved the issues nicely.

Now I'm having issues with actionmailer. Authentication works fine,
but now I'd like to add email confirmation. I'm emailing out a random
integer as a confirmation code, and have a Conformation model mapping
the integers to IDs in the users table. Here's my actionmailer model:

class Accounts < ActionMailer::Base

  def signup_email_confirm(user)
    @user = user
    @recipients = @user.email
    @from = "accounts at myapp.net"
    @subject = "Confirm email address"
    @body["confirmation_id"] = @user.confirmation_id
  end

end

. . . The relevant code from the user model:

class User < ActiveRecord::Base
  attr_accessor :confirmation_id
. . .
end

. . . The portion of my account_controller that sends out the mail:

class AccountController < ApplicationController
  model   :user, :confirmation
. . .

  def confirm_email
    c = {}
    c["user_id"] = @params["id"]
    confirmation = Confirmation.new(c)
    confirmation.id = rand(Time.now)
    confirmation.save
    @user = User.find_first("id = #{@params["id"]}")
    @user.confirmation_id = confirmation.id
    Accounts.deliver_signup_email_confirm(@user)
  end
. . .
end

and the signup_email_confirm.rhtml:
Thanks for signing up! You're almost done.

Before your account is activated, you must visit the following URL:

http://myapp.net/account/confirm/<%= @confirmation_id %>

Your account will then be active, and you can log in using the
username and password you specified.

Unfortunately, @confirmation_id seems to be entirely blank, because
despite receiving the emails, there's nothing after the /confirm
action. The confirmations are being created and look fine, they just
aren't being included in the email.

Thoughts?