3rd party dependency-free solution how to monitor performance of your Rails applications.

[Rails] The Exception Notifier plugin provides a mailer object and a default set oftemplates for sending email notifications when errors occur in a Railsapplication.

Rails plugin for sending asynchronous email with ActionMailer and Resque.

Test your ActionMailer and Mailer messages in Capybara

Send e-mail straight from forms in Rails with I18n, validations, attachments and request information.

The Postmark Rails Gem is a drop-in plug-in for ActionMailer to send emails via Postmark, an email delivery service for web apps.

Rails performance tests (removed from core in Rails 4.0)

Rails plugin for sending asynchronous email with ActionMailer and Resque

Rails plugin for sending asynchronous email with ActionMailer and Resque

Rails observer (removed from core in Rails 4.0)

Gem to extend ActionMailer with SendGrid API support

[description]

Best practice is to send text/plain && text/html markdown works great for both, so why write your templates twices?

An adapter for using Mailgun with Rails and Action Mailer

Easy SQL based report generation with the ability to accept request parameters and render multiple formats.

Ruby wrapper for Mailjet's v3 API

Mail safe provides a safety net while you're developing an application that uses ActionMailer. It keeps emails from escaping into the wild. Once you've installed and configured this gem, you can rest assure that your app won't send ...

Making HTML emails a little less painful. Writes css inline and corrects image urls.

Implement texter classes for sending SMS messages in similar way to how e-mails are sent with ActionMailer-based mailers. Take advantage of e-mail proxying and enhanced phone number parsing, among others.

Test an application's email abilities without ever sending a message to actual live addresses