I already added a custom domain to my Heroku app and it works with www.domain.com.

I need to know how to set up the domain without www to resolve to the app, too.

Here are my current DNS settings:

$TTL 86400
@   IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. (
    2013041500   ; serial
    14400        ; refresh
    1800         ; retry
    604800       ; expire
    86400 )      ; minimum

@                        IN NS      robotns3.second-ns.com.
@                        IN NS      robotns2.second-ns.de.
@                        IN NS      ns1.first-ns.de.

@                        IN A       88.198.38.XXX
localhost                IN A       127.0.0.1
mail                     IN A       88.198.38.XXX
ftp                      IN CNAME   www
imap                     IN CNAME   www
loopback                 IN CNAME   localhost
pop                      IN CNAME   www
relay                    IN CNAME   www
smtp                     IN CNAME   www
www                      IN CNAME   appname.herokuapp.com.
@                        IN MX 10   mail

What are the correct settings to use so that both example.com and www.example.com would point correctly to my Heroku app?

heroku dns
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