[thenduks]

letter_opener[1] is really useful to avoid the test account + wait situation. Well, now you can just use mailer previews, I guess :)

[1]: https://github.com/ryanb/letter_opener

[matthewmacleod]

Also Mailcatcher, which runs a local SMTP server with a nice email-client-style web UI: http://mailcatcher.me

[simple10]

premailer is also useful. Even with the new Rails 4.1 email previews (available in development env), sometimes it's useful to be able to preview in production. https://github.com/fphilipe/premailer-rails