Rails 4.1.14 (November 12, 2015)

• No changes.

Rails 4.1.14.rc1 (October 30, 2015)

• No changes.

Rails 4.1.13 (August 24, 2015)

• No changes.

Rails 4.1.12 (June 25, 2015)

• Mailer preview now uses url_for to fix links to emails for apps running on
  a subdirectory.

  Remo Mueller

• Mailer previews no longer crash when the mail method wasn’t called
  (NullMail).

  Fixes #19849.

  Yves Senn

• Make sure labels and values line up in mailer previews.

  Yves Senn

Rails 4.1.11 (June 16, 2015)

• No changes.

Rails 4.1.10 (March 19, 2015)

• No changes.

Rails 4.1.9 (January 6, 2015)

• No changes.

Rails 4.1.8 (November 16, 2014)

• Attachments can be added while rendering the mail template.

  Fixes #16974.

  Christian Felder

Rails 4.1.7.1 (November 19, 2014)

• No changes.

Rails 4.1.7 (October 29, 2014)

• No changes.

Rails 4.1.6 (September 11, 2014)

• Make ActionMailer::Previews methods class methods. Previously they were
  instance methods and ActionMailer tries to render a message when they
  are called.

  Cristian Bica

• Raise an exception when attachments are added after mail was called.
  This is a safeguard to prevent invalid emails.

  Fixes #16163.

  Yves Senn

• Allow preview interceptors to be registered through
  config.action_mailer.preview_interceptors.

  See #15739.

  Yves Senn

Rails 4.1.5 (August 18, 2014)

• No changes.

Rails 4.1.4 (July 2, 2014)

• No changes.

Rails 4.1.3 (July 2, 2014)

• No changes.

Rails 4.1.2 (June 26, 2014)

• No changes.

Rails 4.1.1 (May 6, 2014)

• No changes.

Rails 4.1.0 (April 8, 2014)

• Support the use of underscored symbols when registering interceptors and
  observers like we do elsewhere within Rails.

  Andrew White

• Add the ability to intercept emails before previewing in a similar fashion
  to how emails can be intercepted before delivery.

  Fixes #13622.

  Example:

  class CSSInlineStyler
  def self.previewing_email(message)
  # inline CSS styles
  end
  end

  ActionMailer::Base.register_preview_interceptor CSSInlineStyler

  Andrew White

• Add mailer previews feature based on 37 Signals mail_view gem.

  Andrew White

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

  Fixes #13090.

  Example:

  class MailerWithCallback < ActionMailer::Base
  after_action :a_callback

  def welcome
  mail subject: “subject”, to: [“joe@example.com”]
  end

  def a_callback
  mail # => returns the current mail message
  end
  end

  Yves Senn

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

  Daniel Schierbeck

• 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

Please check 4-0-stable for previous changes.