title: send smtp email to multiple receivers
body: <p>I am using <a href="https://gist.githubusercontent.com/jpillora/cb46d183eca0710d909a/raw/19c524ccaa1f4003feb0a63bc77477486601eb43/smtp-gmail-send.go" rel="nofollow noreferrer">this</a> to send <code>smtp</code>. It works for one receiver but I'd like to have multiple receivers. I have tried the following:  </p>
  
  <pre><code>func sendemail(body string) {  
      from := "smtpemail" 
      pass := "pass"
      to := "a@gmail.com,b@gmail.com"
      ....
  }
  </code></pre>
  
  <p>I have also tried: </p>
  
  <pre><code>to := "\"a@gmail.com\",\"b@gmail.com\""
  </code></pre>
  
  <p>and:</p>
  
  <pre><code>to := []string{"a@gmail.com","b@gmail.com"}
  </code></pre>
  
  <p>None of them work. Sorry it is so simple, I just begin to work with <code>golang</code>.</p>