[gwd]

    git send-email --dry-run <commitish>

will show you the mail headers it would have generated (including subject lines, To: and Cc: fields).

    git format-patch -o<tempdir> <committish>

will create a separate mail-like file for each patch in <tempdir>. Finally,

    git format-patch --stdout <committish> > foo.mbox

will (I think) generate something which something capable of reading mbox'es should be able to read. (The latter I may be remembering incorrectly, but worth giving a try.)