centos - sendmail not sending mails to @samedomain (target mail is on google apps)

I've set up sendmail to just send out mails from our php web application.
That works fine, as long as we are not sending mail to the same domain as our web app.

e.g.

our app = www.ourapp.com
sending mails works perfectely, except for anything@ourapp.com"

I don't know if it's relevant, but our target email is hosted with google apps.

Sendmail queue is empty and the log files always say the message has been sent

we are running CentOS as our OS

Answer

this problem has solved itself after 1-2 days. It probably just was a DNS update issue, where we got the updated data already, but perhaps the mailservers we have been tested still had old DNS cache.

thanks all for the help on this one