mailcatcher (rubygems):     MailCatcher runs a super simple SMTP server which catches any     message sent to it to display in a web interface. Run     mailcatcher, set your favourite app to deliver to     smtp://127.0.0.1:1025 instead of your default SMTP server,     then check out http://127.0.0.1:1080 to see the mail. 
Keywords: development|devtools|mail|rails|ruby|rubygems|server|smtp