If an email was authenticated with DKIM, you cannot really blame Revolut. The attacker would have had to compromise the government email server, making it the government's fault.
However, if the email relied solely on SPF, the situation is less clear. An attacker could potentially spoof SPF by compromising any service on a server sharing the same public IP address via NAT.
However, if the email relied solely on SPF, the situation is less clear. An attacker could potentially spoof SPF by compromising any service on a server sharing the same public IP address via NAT.