Ruby Library for the mailboxlayer API, a web service that email validation & verification, https://mailboxlayer.com/

Pop3 and MailDir is supported at the moment.

Async mailer without any painful setup

Rails Engine for MailChimp integrations

ArMailer wrapper for Rails 3 with mail priority

With this library you can catch all outgoing e-mails and redirect them to a specific address. This is very useful for testing purpose, for example on your staging/testing server.

gem for pulling changes from a github repository and send mail with differences

Merb plugin for putting mail delivery jobs onto Resque queue

An ActionMailer delivery mechanism to save mails as files in a directory.

Use AppMail with the Ruby mail gem

Automaildoc is a gem to generate a list of about mails from your mail spec.

A mass mailing tool for real threads aficionados

Generate random test data including names, mailing addresses, dates, phone numbers, e-mail addresses, and text.

Mailers for Pakyow

Send mails via EWS, useful for corporation environment like ours which has outlook via office365, but firewall block SMTP (don't ask me why, dunno).

A utility to send commit mails for commits pushed to git repositories.

Allows you to set up a second email to the form submitter that differs from the email sent to regular mail receiver.

Provides various view helpers for cross client mail creation

Extension to authlogic-connect for Mail.ru authentication support

A mail utility so dense, no message can escape.