Depending on how you know your recipient and the nature of the message, you might do well to contact them over social media instead of email, which, let's face it, is often just ontologically terrible. Also, anecdotally, according to me, people on mobile are more likely to ignore a boring email push notification than an *exciting* new social media alert.
If you're setting things up with an old friend or just need to send a quick link, try a Facebook message. To congratulate a work colleague, go ahead and do it publicly on Twitter; you'll make them look good in front of everyone. (Obviously, save private conversations for more private media.)