if (h->new_env)
mutt_free_list (&h->new_env->references);
else
h->new_env = mutt_new_envelope ();
h->new_env->references = mutt_copy_list (h->env->references);
if (h->new_env)
mutt_free_list (&h->new_env->references);
else
h->new_env = mutt_new_envelope ();
h->new_env->references = mutt_copy_list (h->env->references);