class Notifier < ActionMailer::Base
   def signup_notification(recipient)
     recipients recipient.email_address_with_name
     bcc        ["bcc@example.com"]
     from       "system@example.com"
     subject    "New account information"
     body       :account => recipient
   end
 end

Actually, yesterday we were getting “uninitialized constant ActionMailer::Quoting::Encoding” while using ActionMailer in production but it was working fine in all modes(development/production) on localhost. Our mailer was like:

 class Notifier < ActionMailer::Base
   def signup_notification(recipient)
     @recipients   = recipient.email_address_with_name
     @bcc            = ["bcc@example.com"]
     @from          = "system@example.com"
     @subject       = "New account information"
     @body          = :account => recipient
   end
 end

We could not find the actual issue with this mailer. But the above said error was disappeared when we changed the same mailer as following:

 class Notifier < ActionMailer::Base
   def signup_notification(recipient)
     recipients recipient.email_address_with_name
     bcc        ["bcc@example.com"]
     from       "system@example.com"
     subject    "New account information"
     body       :account => recipient
   end
 end

Do you guys have any idea? I would love to listen from you.

Update: No its not solved yet. Still same issue. May be some issue with character encoding with the TMail object.

Update 2: This was the issue http://github.com/hmcgowan/roo/issues#issue/4/comment/106328

OpenSSL::SSL::SSLError (hostname was not match with the server certificate):
    /usr/lib/ruby/1.8/openssl/ssl.rb:123:in `post_connection_check'
    /usr/lib/ruby/1.8/net/smtp.rb:582:in `tlsconnect'
    /usr/lib/ruby/1.8/net/smtp.rb:562:in `do_start'
    /usr/lib/ruby/1.8/net/smtp.rb:525:in `start'
    /vendor/rails/actionmailer/lib/action_mailer/base.rb:671:in `perform_delivery_smtp'
    /vendor/rails/actionmailer/lib/action_mailer/base.rb:526:in `__send__'
    /vendor/rails/actionmailer/lib/action_mailer/base.rb:526:in `deliver!'
    /vendor/rails/actionmailer/lib/action_mailer/base.rb:392:in `method_missing'
    /app/controllers/users_controller.rb:40:in `send_email_to_confirm_user'

Actually, Rails 2.2.2 turn on STARTTLS if it is available in Net::SMTP (added in Ruby 1.8.7) and the SMTP server supports it.

If you use postfix, then you fix it quickly by disabling tls by setting “smtpd_use_tls=no” in /etc/postfix/main.cf .

Remember to restart postfix and rails app server.