Email routing with website form

Hello, I have configured email routing on my cloudflare account setting as custom address"[email protected]" and destination address"[email protected]"

I notice that routing only works with direct email: sending direct email  (es from gmail) to "[email protected]" are forward to"[email protected]".

But this not works if the messages are sent from the site's wordpress contact form
Contact form send email to [email protected] and with routing the destination should be "[email protected]" but this does not happen.  

Cloudflare routing seems to be bypassed and email arrived to [email protected] instead to "[email protected]"

Can anyone guide me to fix it?
I miss some settings?

Thanks for your support.
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I am also wondering if this is possible