ActionMailer 3 makes it much easier to send emails, but there is one case it doesn't handle well.\ Specifically, it is difficult to send a message that has the proper MIME hiearchy for an email with both HTML and text alternatives\ that also includes attachments. This gem solves that need.

Mailgun adapter for Rails.

Rails plugin, send and preview email with GOV.UK Notify

Easily switch between email APIs

The default authentication extension for Refinery CMS

An adapter for using Sendcloud with Rails and Action Mailer

Gem to extend ActionMailer with SendGrid SMTP API support

adds before_create, around_create callbacks to action mailer 3

A different take on using ActionMailer, Markdown and I18n.

AwesomeMailer embeds your e-mail CSS inline, allowing you to write e-mail templates without worrying too much about stylesheets

Plugin for sending asynchronous email with Backburner

When the object or arg to a delayed_job is a Mongoid document, store only a small stub of the object instead of the full serialization.

Create web applications using Dojo Toolkit (1.8) and Ruby on Rails 3

An adapter for using Elastic Email with Rails and Action Mailer

Feedbacker provides a pull out tab on the side of every page on a site for users to send feedback to the site.

This gem add google analytics campaign tags to every link in your action mailer

Rack handler for monitoring several parts of a web application so one request can determine which system or dependencies are down.

This gem helps you to track key indicators in your Rails app.

Combines Liquid and Markdown templating for safe customer-editable pages and emails. Also supports templates from the database

Litmus Mailer adds an ActionMailer observer to update your Litmus tests each time an email is delivered from development.