No, if you receive an email with the subject 'Notification of the General Police Directorate', do not delete it, you must open it and read it, since it is a notification that informs you that your DNI certificates expire shortly.
Today it is difficult to know if the mail or message we receive is really real or is simply spam or some type of message that wants to steal data for a few to profit and in the face of such an avalanche of spam and spam, we choose to be suspicious and that is good. So much so that we have received a notification from the National Police and we have quickly deleted it from our email account, but don't worry, this 'Notification of the General Police Directorate' is not a scam or an email that wants to steal data, it is a good and real email.
Anyone can receive this email from the National Police at any time, but you can rest assured, they're not looking to arrest or fine you. It's simply an informational email, informing you that an identification document is about to expire and they want you to renew it. It's as simple as that. The email is sent from an official Police email account enabled for sending notifications.[email protected]), but some may have been cautious and suspicious, which is why the police have tweeted about it.
The Police do it to inform us that there is an upcoming expiration in the DNI certificate and we have to go as soon as possible to update it. The mail is quite clear and simple and the most important thing, asks that 'PLEASE DO NOT ANSWER', which should leave us more calm and should help us possible falsifications of this type of mail. The email is created to inform the user, that gives it more accuracy. So, when you receive an email with the subject 'Notification of the General Police Directorate', do not delete it directly, read it, because you are being informed that you must carry out a procedure to update your DNI certificate, which is something free and voluntary.

Source: National Police