Probably abuse of some product like Google Forms or another service. Different subdomain, but same issue https://www.suped.com/learn/dmarc/how-to-deal-with-spa

Probably abuse of some product like Google Forms or another service. Different subdomain, but same issue https://www.suped.com/learn/dmarc/how-to-deal-with-spam-from-trixbouncesgooglecom-google-forms https://www.suped.com/learn/dmarc/how-to-deal-with-spam-from...