Footnotes in mutt/vi/elvis

[powdarrmonkey]

Ok, another powdarrmonkey long shot...

I notice on a lot of mailing lists urls are shown as [n] and an accompanying footnote is provided with the address in. I can't find anyway of doing this automatically myself, short of by hand, using mutt and vi/elvis. It may be done by the list software, but my mails haven't show up like this so I suspect it's client software. Can anyone shed any light on this, or is everyone else just more diligent than me?

TIA.

[ajtaylor]

I seem to remember there was an emacs bundle that would do this - possibly part of gnus, but it's been a while since I used gnus to read my mail, so I could be imagining it!