You can close this topic, there was a problem with 1 of the files. An update of the files solved all the problems.
I'm using validates_email_veracity_of to check if an email adres is valid, but a couple of days ago it stopped working. Could it be possible that a nameserver is down or is the plugin broke?
This is my validation code
validates_presence_of :name, :email, :subject, :address, :city, :message, :ip, :language validates_email_veracity_of :email, :domain_check => true, :mx_only => false
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Is there someone who knows another plugin that does the job?