GMail Stuck on “Sending…”

After restoring my Galaxy Nexus, all was fine except for sending email.  I could get email, but when I tried to send one, the message would go in the Outbox with “Sending…” next to it.   Rebooting didn’t help.  Neither did wiping the cache from Recovery.  The answer was to clear data for GMail in the Application Manager under Settings.  The link says to do this for the GMail Storage app, too, but I didn’t have one of those.  Just clearing GMail was enough.