for two days now I always get the following message when receiving or trying to send mails in /exim4/mainlog
2011-12-09 15:05:41 1RZ153-00028W-AS DKIM: d=gmail.com s=gamma c=relaxed/relaxed a=rsa-sha256 [verification succeeded] 2011-12-09 15:05:42 1RZ153-00028W-AS H=mail-ee0-f53.google.com [74.125.xx.xx] F= <firstname.lastname@example.org> temporarily rejected after DATA
when trying to send mails. Receiving is also not working. Restarting exim didn't help...
Does anyone know what could be the problem?