DeliveryUncle (Rails Engine) that you can hire to manage outgoing email. It provides:

• Service object to deliver action_mailer's mail message. i.e. DeliveryUncle::Deliver
• Records of outgoing emails requests in database. i.e. DeliveryUncle::EmailRequest
• Email sending in background by default (currently with Resque).
• Views to manage (e.g. block/unblock) outgoing emails.
• .. etc

1. Add delivery_uncle into Gemfile
   gem 'delivery_uncle'

2. Install migration
   rails generate delivery_uncle:install

3. Start Resque
   rake environment resque:work QUEUE='*'

1. Send email with service object: DeliveryUncle::Deliver
DeliveryUncle::Deliver.new(AccountMailer, :new_registration, user.email)

2. Check the email records (e.g. status) with the model: DeliveryUncle::EmailRequest DeliveryUncle::EmailRequest.where(mailer: 'AccountMailer')

3. Mount views to your rails app in config/routes.rb
mount DeliveryUncle::Engine => "/mails"

• Save email request
• Send email in background
• Block/unblock/pause/retry outgoing emails in views

• Remove record manipulation after enqueuing to background

This project rocks and uses MIT-LICENSE.