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One would really hope that such an address cannot be externally addressed ;)

I look forward to another cleverly-named security flaw that allows someone to take down entire e-mail servers with a single externally-sent email.

The domain is nhs.uk ;)

The domain is .nhs.net ;)

Some individual trusts have @trust.nhs.uk addresses, most - probably two thirds use the .nhs.net system.