Robert-Jon on "Contact Form 7 not mailing to google apps accounts"

I know this has been asked before, but none of the previous threads have solved my problem.

I'm getting the green box, but no e-mail is showing up in google apps accounts. I have tried two separate google apps addresses on different domains. (One same as the site, one different.) I have also tried a hotmail and a gmail address. The latter ones work instantly, the google apps accounts don't.

I've installed the WP-Mail-SMTP plugin as suggested in several threads and put the mail-method to PHP mail(), to no avail.

I'm seeing the following on the server:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [TO google apps address]

------ This is a copy of the message, including all the headers. ------

Return-path: <[FROM wordpress address]>
Received: from apache by vserver37.axc.nl with local (Exim 4.76)
        (envelope-from <[FROM wordpress address]>)
        id 1UQNxr-000841-5R
        for [TO google apps address]; Thu, 11 Apr 2013 22:19:23 +0200
To: [TO google apps address]
Subject: Contact form - RJ via Robert-Jon.com
X-PHP-Script: robert-jon.com/index.php for 82.157.60.51
Date: Thu, 11 Apr 2013 20:19:23 +0000
From: RJ <[FROM addres, entered in form]>
Message-ID: <bb81fde19c35d64bbc8445223a89c8a1@robert-jon.com>
X-Priority: 3
X-Mailer: PHPMailer 5.2.1 (http://code.google.com/a/apache-extras.org/p/phpmailer/)
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset="UTF-8"

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Any ideas?

http://wordpress.org/extend/plugins/contact-form-7/