title: Most reliable way to deliver emails from a users email address in rails?
body: <p>I would like to allow users to send emails which are generated in my rails app from <strong>their</strong> email address .</p>
  
  <p>I know I can just use my servers sendmail, and set the from address to their email address, but there is a high chance the emails will be marked as spam.</p>
  
  <p>Is there a better way to do this? Can I use <a href="http://sendgrid.com/">sendgrid</a>, or <a href="http://aws.amazon.com/ses/">Amazon SES</a> or make the user input their own SMTP details.</p>
  
  <p>Any suggestions or best practices would be much appreciated.</p>