Contact Form 7 – HTML breaks

Hi there,

I set up a form so people can apply for projects. I am using Contact Form 7 for this purpose. All the inputed information is send to our main mail adress with html support (the “use html” box is checked). So far everythink worked well. Now I would like to use your greate plugin to make the data transfer safe on every end. This works fine up to some point, meaning the mails are send encrypted and can be decrypted by us.

However, the html code seems to break. The header of the emails received looks like this:

Return-path: <schamlos.be_run@immer7-11.glei.ch>
Envelope-to: info@schamlos.be
Delivery-date: Mon, 12 Aug 2019 09:07:01 +0200
Received: from immer6-21.glei.ch ([192.168.1.99]) 
	by immer12-20.glei.ch with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)
	(Exim 4.92)
	id 1hx4Q0-0002il-Q1
	for info@schamlos.be; Mon, 12 Aug 2019 09:07:00 +0200
Received: from localhost ([127.0.0.1]) 
	by immer6-21.glei.ch with esmtp (Exim 4.92)
	id 1hx4Py-0006Y6-48
	for info@schamlos.be; Mon, 12 Aug 2019 03:06:58 -0400
X-Virus-Scanned: amavisd-new at glei.ch
Received: from immer6-21.glei.ch ([127.0.0.1])
	by localhost (immer6-21.glei.ch [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id qs4mtj6xsxBz for <info@schamlos.be>;
	Mon, 12 Aug 2019 03:06:54 -0400 (EDT)
Received: from immer7-11.glei.ch ([192.168.1.87]) 
	by immer6-21.glei.ch with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)
	(Exim 4.92)
	id 1hx4Pt-0006Xu-Mu
	for info@schamlos.be; Mon, 12 Aug 2019 03:06:53 -0400
Received: by immer7-11.glei.ch with local (Exim 4.92)
	id 1hx4Pq-0000on-6U
	for info@schamlos.be; Mon, 12 Aug 2019 09:06:51 +0200
To: info@schamlos.be
Subject: Eingabe: ####
Date: Mon, 12 Aug 2019 07:06:50 +0000
From: "#### via admin@schamlos.be" <admin@schamlos.be>
Reply-To: ex.am@p.le
Message-ID: <22da9526a7c2555bcf552eca59c50bfa@schamlos.be>
X-Mailer: PHPMailer 5.2.22 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: multipart/alternative;
	boundary="b1_22da9526a7c2555bcf552eca59c50bfa"
Content-Transfer-Encoding: 8bit

This is a multi-part message in MIME format.

--b1_22da9526a7c2555bcf552eca59c50bfa
Content-Type: text/plain; charset=us-ascii
....

Reading other posts concerning this topic, the problem seem to be the last line: Content-Type: text/plain; charset=us-ascii. I guess it should be utf-8? Am I right about this? Do you know how to change Contact Form 7’s behaviour to use a different encoding?

Every bit of help is greatly appreciated.

Thank you very much and kind regards,
Sam*

The page I need help with: [log in to see the link]