bodenfels on "[Plugin: Contact Form 7] form sent twice using on_submit or on_sent_ok"

Actually I found out that the form data was already deleted when I called my custom function. So I found another way - this one helped me:

http://wordpress.org/support/topic/plugin-contact-form-7-run-a-function-before-sending-post?replies=5

This way I can do some stuff with my data before sending and I receice only one mail... :-)