How to catch error exception in ActionMailer

Question

The problem is how can I catch exception in delivering mail by ActionMailer. For me it sounds impossible, because in this case ActionMailer should sent mail to mailserver, a

Answer 1

If you are sending a lot of emails, you can also keep your code more DRY and get notifications of exceptions to your email by doing something like this:

status = Utility.try_delivering_email do
  ClientMailer.signup_confirmation(@client).deliver
end

unless status
  flash.now[:error] = "Something went wrong when we tried sending you and email :("
end

Utility Class:

class Utility
  # Logs and emails exception
  # Optional args:
  # request: request Used for the ExceptionNotifier
  # info: "A descriptive messsage"
  def self.log_exception(e, args = {})
    extra_info = args[:info]

    Rails.logger.error extra_info if extra_info
    Rails.logger.error e.message
    st = e.backtrace.join("\n")
    Rails.logger.error st

    extra_info ||= "<NO DETAILS>"
    request = args[:request]
    env = request ? request.env : {}
    ExceptionNotifier::Notifier.exception_notification(env, e, :data => {:message => "Exception: #{extra_info}"}).deliver
  end

  def self.try_delivering_email(options = {}, &block)
    begin
      yield
      return true
    rescue  EOFError,
            IOError,
            TimeoutError,
            Errno::ECONNRESET,
            Errno::ECONNABORTED,
            Errno::EPIPE,
            Errno::ETIMEDOUT,
            Net::SMTPAuthenticationError,
            Net::SMTPServerBusy,
            Net::SMTPSyntaxError,
            Net::SMTPUnknownError,
            OpenSSL::SSL::SSLError => e
      log_exception(e, options)
      return false
    end
  end
end

Got my original inspiration from here: http://www.railsonmaui.com/blog/2013/05/08/strategies-for-rails-logging-and-error-handling/

Answer 2

This is inspired by the answer given by @sukeerthi-adiga

class ApplicationMailer < ActionMailer::Base
  # Add other exceptions you want rescued in the array below
  ERRORS_TO_RESCUE = [
    Net::SMTPAuthenticationError,
    Net::SMTPServerBusy,
    Net::SMTPSyntaxError,
    Net::SMTPFatalError,
    Net::SMTPUnknownError,
    Errno::ECONNREFUSED
  ]

  rescue_from *ERRORS_TO_RESCUE do |exception|
    # Handle it here
    Rails.logger.error("failed to send email")
  end

end

The * is the splat operator. It expands an Array into a list of arguments.

More explanation about (*) splat operator

Answer 3

This should work in any of your environment files. development.rb or production.rb

config.action_mailer.raise_delivery_errors = true

Answer 4

I'm using something like this in the controller:

 if @user.save
      begin
      UserMailer.welcome_email(@user).deliver
      flash[:success] = "#{@user.name} created"
      rescue Net::SMTPAuthenticationError, Net::SMTPServerBusy, Net::SMTPSyntaxError, Net::SMTPFatalError, Net::SMTPUnknownError => e
        flash[:success] = "Utente #{@user.name} creato. Problems sending mail"
      end
      redirect_to "/"

Answer 5

class ApplicationMailer < ActionMailer::Base
  rescue_from [ExceptionThatShouldBeRescued] do |exception|
    #handle it here
  end
end

Works with rails 5 onwards. And it's the best practice.