This is really strange… would you mind letting me know (contact@kevinbongart.net) if that's a commercial firewall, or if a specific message shows up? First time

This is really strange… would you mind letting me know (contact@kevinbongart.net) if that's a commercial firewall, or if a specific message shows up? First time I hear about this issue, I wouldn't want it to affect other people. Thanks!