I also checked the website with Google safe browsing (https://transparencyreport.google.com/safe-browsing/search?u...) and the result is also OK. I also run the test with virus total website and no threats have been detected. (https://www.virustotal.com/en/#url).
If you have more information about this do not hesitate to share!
It's probably a combination of young domain, and associated IPs blocked from mail.
Check on Cisco Talos https://talosintelligence.com/ Submit ticket: https://talosintelligence.com/reputation_center/support#repu...
That's probably the reason !
I also checked the website with Google safe browsing (https://transparencyreport.google.com/safe-browsing/search?u...) and the result is also OK. I also run the test with virus total website and no threats have been detected. (https://www.virustotal.com/en/#url).
If you have more information about this do not hesitate to share!