Mailprovider flags email from firstname.lastname@example.org as malicious
I use protonmail as e-mail provider and when receiving e-mails from the email@example.com address i’m presented with the following error message:
“This email has failed its domain’s authentication requirements. It may be spoofed or improperly forwarded!”
Please investigate & fix.
This must be an issue with your email provider. I would check with them first.