I just found out about Pony, a Ruby gem for sending emails.
The cool thing about Pony is how simple it is. Good work, people!
Pony.mail(:to => 'email@example.com', :via => :smtp, :smtp => { :host => 'smtp.example.com', :port => '25', :user => 'username', :password => 'passkey', :auth => :plain, :domain => "example.com" }, :from => 'me@example.com', :subject => 'hi', :body => 'Hello there.')
I'm planning on using this with Sinatra, but I'll probably end up using it with some Ruby scripts as well.
Speaking of which, I bought a book about using Ruby for systems administration awhile back. It had some really cool ideas in it, but I wasn't as comfortable with Ruby back then as I am now.
I definitely have to give this book a review!