Email / PHP contact form

I have a domain name and a site (www.andrz.nl). It is hosted at 000webhost. My site has a contact page (PHP). Messages sent from the contact page are forwarded to my Gmail. This has not worked for a month. I can see that the message has been sent, but it is no longer coming in. Nothing has been changed to the site or the settings. What could be the problem and how could it be solved?

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