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Bonjour Grégoire,
I finally managed to implement the CNAME solution.
This is adapted to our use case because we created a Marketo macro (I only need to provide it with the form ID) on our website. So we only had to switch from app-sjst.marketo.com to our CNAME in one place once for all (we are embedding the code from the Marketo forms right into our website pages).
Example:
Situation before implementing the CNAME option > This embed code would have been blocked by Adblockers:
<script src="//app-sjst.marketo.com/js/forms2/js/forms2.js"></script>
<form id="mktoForm_1026"></form>
<script>MktoForms2.loadForm("//app-sjst.marketo.com", "299-BYM-827", 1026);</script>
After my change > this bypasses AdBlockers:
<script src="//go.example.com/js/forms2/js/forms2.js"></script>
<form id="mktoForm_1026"></form>
<script>MktoForms2.loadForm("//go.example.com", "299-BYM-827", 1026);</script>
About our landing page templates embedding Marketo forms, we did the same thing for all the templates (not a lot of work).
I spent more time searching for this information than on the implementation 
Thanks for your help!
Benjamin
Hi guys,
if you use the new landing page form with lightbox you should also take this solution from Benjamin for your landing page for bypasses AdBlockers.
I also recognized for my very long landing page (around 5000px), that the lightbox starts with my own CNAME util 3 sec faster.
<button class="lightboxButton" onclick="
MktoForms2.loadForm('//go.example.com', 'xxx-xxx-xxx', 2331, function (form){MktoForms2.lightbox(form).show();});">
Download your datasheet here
</button>
Best Felix
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