A quite minimalistic, but easy to deploy PHP class for EmailMashup.
$email = new TacEmail\Email('username', 'apikey12345', array(
'from' => 'notifications@domain.com',
'from_name' => 'Domain.com notificator'
));
$email->send('receiver@gmail.com', 'Hello there!', "Hello!\n\nYou are awesome.\n\nCheers");