title: Address in mailbox given [] does not comply with RFC 2822, 3.6.2. when email is in a variable
body: <p>I have a correct email address. I have echoed it, but when I send it, I get the following error:</p>
  
  <pre><code> Address in mailbox given [] does not comply with RFC 2822, 3.6.2. 
  </code></pre>
  
  <p>Why? I use laravel (swift mailer) to send email:</p>
  
  <pre><code>$email = email@address.com
  </code></pre>
  
  <p>and then when I send it, the error is thrown.</p>
  
  <p>But if I directly use the string, it sends it.</p>
  
  <p>Here is the block:</p>
  
  <pre><code> Mail::send('emails.activation', $data, function($message){
              $message-&gt;to($email)-&gt;subject($subject);
          });
                  -&gt;with('title', "Registered Successfully.");
  </code></pre>