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)

Gem to extend ActionMailer with SendGrid API support

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 emails to external email addresses. Instead, emails that would normally be delivered to external addresses will be sent to an address of your choosing, and the body of the email will be appended with a note stating where the email was originally intended to go.

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.

A set of patches for mikel's mail gem. With this, you can easily send and receive mails with ISO-2022-JP enconding (so-called 'JIS-CODE').

A delivery method to send your notifications via email using ActionMailer.

The Let's Encrypt certificate manager for rails

Asynchronous mail delivery using sidekiq

Super simple capistrano deployment notifications.

New generation ruby client for IronWorker

Specify a domain (or set of domains, or magic word in email address) email is allowed to go to, and email to all other domains is silently dropped. Useful for testing and staging environments.

SMSEasy allows you to send text messages to a mobile recipient for free. It leverages ActionMailer for delivery of text messages through e-mail. Based on the Brendan Lim's sms-easy.

Automatically insert a text/plain part into your HTML multipart e-mails.

Capistrano Deployment Email Notification. Keep the whole team informed of each release!