KONTAKTFORMULAR landet im SPAM

Hey Peter,
Sorry for the late reply, I believe that I understand that when a customer uses your form, their message lands in your spam folder, so your host requires the “reply-from” to not be marked as spam.
Are you using SMTP to send mail, perhaps a SMTP plugin?
This makes since, we have this code for that case, Try adding this code to the end of your functions.php file in Appearance > Editor:

add_filter('avf_form_from', 'avf_form_from_mod', 10, 3);
function avf_form_from_mod($from, $new_post, $form_params) {
	global $enfold_custom_from_header;
	$enfold_custom_from_header = $from;
	$from = " (Email address hidden if logged out) ";
	return $from;
}

add_filter('avf_form_autoresponder_from', 'avf_form_autoresponder_from_mod', 10, 3);
function avf_form_autoresponder_from_mod($from, $new_post, $form_params) {
	global $enfold_custom_from_header;
	return $enfold_custom_from_header;
}

please replace ” (Email address hidden if logged out) ” with your email

Best regards,
Mike

Hi,
Do you mean that the messages from your site are landing in your spam folder? This would mean that you are getting them and if you white list them with your spam filter then they will land in your inbox.
Spam filter are pretty advanced now and yours is detecting that you are spoofing the address, but white listing it will tell your filter that you want the messages.

Best regards,
Mike

Hi,
Sounds like you will need to use a SMTP plugin so that your email is actually sent by a SMTP server, spam filters can tell the difference from faked or spoofed email and email sent from a real address.
The first step would be to set up a email account on your server, and then use a plugin such as: WP Mail SMTP, then when email is sent it is sent from your email server, not your website.

Best regards,
Mike