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Rails 4.0.6 (June 23, 2014)

No changes

Rails 4.0.5 (May 6, 2014)

No changes

Rails 4.0.4 (March 14, 2014)

  • Calling mail() without arguments serves as getter for the current mail message and keeps previously set headers.


    class MailerWithCallback < ActionMailer::Base
      after_action :a_callback
      def welcome
        mail subject: "subject", to: [""]
      def a_callback
        mail # => returns the current mail message

    Yves Senn

Rails 4.0.3 (February 18, 2014)

No changes

Rails 4.0.2 (December 02, 2013)

No changes

Rails 4.0.1 (November 01, 2013)

  • Instrument the generation of Action Mailer messages. The time it takes to generate a message is written to the log.

  • Invoke mailer defaults as procs only if they are procs, do not convert with to_proc. That an object is convertible to a proc does not mean it's meant to be always used as a proc.

    Fixes #11533.

    Alex Tsukernik

Rails 4.0.0 (June 25, 2013)

  • Allow passing interpolations to #default_i18n_subject, e.g.:

    # config/locales/en.yml
          subject: 'Hello, %{username}'
    # app/mailers/user_mailer.rb
    class UserMailer < ActionMailer::Base
      def welcome(user)
        mail(subject: default_i18n_subject(username:

    Olek Janiszewski

  • Eager loading made to use relation's in_clause_length instead of host's one. Fixes #8474.

    Boris Staal

  • Explicit multipart messages no longer set the order of the MIME parts.

    Nate Berkopec

  • Do not render views when mail isn't called. Fixes #7761.

    Yves Senn

  • Allow delivery method options to be set per mail instance.

    If your SMTP delivery settings are dynamic, you can now override settings per mail instance for e.g.

    def my_mailer(user, company)
      mail to:, subject: "Welcome!",
           delivery_method_options: { user_name: company.smtp_user,
                                      password: company.smtp_password }

    This will ensure that your default SMTP settings will be overridden by the company specific ones. You only have to override the settings that are dynamic and leave the static setting in your environment configuration file (e.g. config/environments/production.rb).

    Aditya Sanghi

  • Allow to set default Action Mailer options via config.action_mailer.default_options=. Robert Pankowecki

  • Raise an ActionView::MissingTemplate exception when no implicit template could be found. Damien Mathieu

  • Allow callbacks to be defined in mailers similar to ActionController::Base. You can configure default settings, headers, attachments, delivery settings or change delivery using before_filter, after_filter, etc. Justin S. Leitgeb

Please check 3-2-stable for previous changes.

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