In the Mac Mail app, copying an email address of someone in your address book (e.g. from the header of some message) and pasting it elsewhere (e.g. in Text Edit) will result in "first_name last_name <mail address>" being pasted rather than just mail address or at least "<mail address>".
There used to be a Preference setting for this (see e.g. this osxdaily.com article), but this does not seem to work under Yosemite.
Is there a way to paste only the mail address, also if multiple contacts are copied under Yosemite?