How to set reply_to/reply-to using SparkPosts Ruby API client?
<p>It seems like I can't set <code>reply_to</code> in <code>vals</code> hash when I'm using <code>SparkPost::Client.new().send_message(param1,param2,etc...)</code>. Egs here: <a href="https://github.com/SparkPost/ruby-sparkpost" rel="nofollow">https://github.com/SparkPost/ruby-sparkpost</a> </p>

<p>Meaning, when I send an email through the client - I want the end-user (that receives the email) to automatically have the <code>reply_to</code> attr (NOT the <code>from</code> attr) fill out the <em>Reply To:</em> field for a given ESP.</p>

<p>I've also seen this: <a href="https://github.com/SparkPost/ruby-sparkpost/blob/master/examples/transmission/with_template.rb" rel="nofollow">https://github.com/SparkPost/ruby-sparkpost/blob/master/examples/transmission/with_template.rb</a>. Which uses <code>send_payload</code>.</p>

<p>Does anyone know how to set the <code>reply_to</code>so it doesn't simply default to the <code>from</code>'s email address?</p>