"For security reasons, we have not included a link with this email."

[anthonygood]

Why is this? The CONTRIBUTING.md adds a detail which offers no clarification:

For security reasons, it is currently HMRC policy that there are no links in emails, either in HTML or plain text, hyperlinked or not.

This is because there is no guaranteed way to stop an email reader, plain text or HTML based, from spotting a http://wherever.com/some-url link and turning it into a hyperlink - this has been researched extensively. The only permissible exception to this under policy is verification links, which are vital for proving a customer's address.

What's the rationale for this policy?