title: How do you set up a custom domain with CNAME on Heroku without messing up email service?
body: <p>I have a Rails app uploaded to Heroku and I'd like to use it for a custom domain name. I also have email for this domain name on 1and1 where I registered it and it's been in use and needs to remain working. I tried following <a href="http://blog.heroku.com/archives/2009/10/7/heroku_casts_setting_up_custom_domains/" rel="nofollow">this tutorial</a> but it recommends using naked domains which Heroku is strongly discouraging. If I shouldn't use naked domains (is that better?), how do I use CNAME instead while still keeping the email functional?</p>