Cannot forward emails to zohodesk

Cannot forward emails to zohodesk

I have set up an email address on my site which forwards directly to the support email address on zohodesk like this:

support@xxxxxx.com > support@xxxxxx.zohodesk.eu

However, no emails are ever arriving in zohodesk. I've checked and the forwarding is working fine, the original email is fine as well. But even when I write directly to support@xxxxxx.zohodesk.eu the email never comes through. Email fetching is also enabled.

It's completely dead in the water. 

We are currently with Zendesk and are looking at alternatives; zohodesk looks ideal but this (and other elements) do not work.