[subsection1h]

    Curious, without HTML do you expect everyone to
    copy-paste confirmation and password reset links?

You've seriously never used an email client that makes plain text URIs clickable?

[nivla]

To be honest, I have never paid attention to it. However, I believe its not in the standard or RFC to automatically convert http:// and mailto:// text into clickable links. Therefore I wouldn't be surprised if there are email client that doesn't support it.