title: Trac html Notifications
body: <p>I am setting up Trac, on windows. I used a Bitnami installer. It is the newest stable version 1.2.3. I have a lot of stuff setup, including notifications, but I want to see HTML notifications. The plain text emails look wierd.
  I did add the TracHtmlNotificationPlugin. Before doing that I was not getting emails with the default_format.email set to text/html.
  Now I get the emails but they are still in plain text.</p>
  
  <p>This is my trac.ini notification section. Let me know if I am missing something.</p>
  
  <pre><code>[notification]  
  admit_domains = domain.com  
  ambiguous_char_width = single  
  batch_subject_template = ${prefix} Batch modify: ${tickets_descr}  
  default_format.email = text/html  
  email_sender = HtmlNotificationSmtpEmailSender  
  ignore_domains =   
  message_id_hash = md5  
  mime_encoding = base64  
  sendmail_path =   
  smtp_always_bcc =   
  smtp_always_cc =   
  smtp_default_domain =   
  smtp_enabled = enabled  
  smtp_from = trac@domain.com  
  smtp_from_author = disabled  
  smtp_from_name =   
  smtp_password =   
  smtp_port = 25  
  smtp_replyto =   
  smtp_server = smtp.domain.com  
  smtp_subject_prefix =   
  smtp_user =   
  ticket_subject_template = ${prefix} #${ticket.id}: ${summary}  
  use_public_cc = disabled  
  use_short_addr = disabled  
  use_tls = disabled  
  </code></pre>
  
  <p>I have my domain replaced in the real file.<br>
  Like I said I get emails now, just not html emails.</p>
  
  <p>Edit:<br>
  I changed back the setting and now  </p>
  
  <pre><code>Trac[web_ui] ERROR: Failure sending notification on change to ticket #7: KeyError: 'class'
  </code></pre>
  
  <p>Edit 2:
  Fixed the error by putting the htmlnotification_ticket.html file (from the plugin) into the templates directory.</p>