title: What's the state of the art in email validation for Rails?
body: <p>What are you using to validate users' email addresses, and why?</p>
  
  <p>I had been using <a href="https://github.com/Empact/validates_email_veracity_of" rel="noreferrer"><code>validates_email_veracity_of</code></a> which actually queries the MX servers. But that is full of fail for various reasons, mostly related to network traffic and reliability. </p>
  
  <p>I looked around and I couldn't find anything obvious that a lot of people are using to perform a sanity check on an email address. Is there a maintained, reasonably accurate plugin or gem for this?</p>
  
  <p>P.S.: Please don't tell me to send an email with a link to see if the email works. I'm developing a "send to a friend" feature, so this isn't practical.</p>