Bit of an assumption on the cause
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"It does beg the question why a government department is relying on someone to manually send out e-mails like this from their mail client rather than using a proper CRM/mailer daemon," noted one Reg reader who was included in the gaffe."
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I've worked for plenty of companies who are set up with Mailchimp or similar, or in-house ways of sending bulk email etc, and they STILL manage to do this at some point - usually when the person who would usually send out the mail goes on holiday and some numpty thinks "Oh, I can handle this, easy..."
I'm not excusing it, mind - my face is fully in my palm, as it is every time I see this happen...