I switch to code, insert <iframe scr="http://www.rmls.com"></iframe> and click publish
I then gert this error (either a post or page and of course the page.php - post.php) is returned.
Forbidden
You don't have permission to access /wp-admin/page.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
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Apache/1.3.37 Server at www.billjonesproperties.com Port 80