actionmailer/CHANGELOG.md


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

    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](https://github.com/rails/rails/blob/4-0-stable/actionmailer/CHANGELOG.md) for previous changes.