Fixing “Copy Address” in Mail on 10.6
mjtsai.com/blog/2009/10/16/fixing-copy-address-in-mail-on-10-6
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Ken Aspeslagh shows how to restore the Leopard behavior of having Mail’s “Copy Address” command copy just the address, rather than the name and the address (via Justin Williams).