A related article from the UK gov: https://www.gov.uk/guidance/keeping-your-domain-name-secure https://www.gov.uk/guidance/keeping-your-domain-name-secure (the

A related article from the UK gov: https://www.gov.uk/guidance/keeping-your-domain-name-secure https://www.gov.uk/guidance/keeping-your-domain-name-secure (they also have one to harden mails, OP: https://www.gov.uk/guidance/securing-government-email https://www.gov.uk/guidance/securing-government-email)