Stop batch mode emails with no argument or recipients.

Closes #345.  There are checks in send.c to guard against a
no-recipient email being sent, but there might be a my_hdr or other
setting in the muttrc.  In that case, it would be surprising for an
email to be sent.

1 files changed, 10 insertions, 2 deletions

diff --git a/main.c b/main.c
index 852874e1..329db223 100644
--- a/main.c
+++ b/main.c
@@ -957,8 +957,8 @@ int main (int argc, char **argv, char **environ)
       mutt_flushinp ();
     mutt_send_message (SENDPOSTPONED, NULL, NULL, NULL, NULL);
   }
-  else if (subject || msg || sendflags || draftFile || includeFile || attach ||
-	   optind < argc)
+  else if (subject || msg || (sendflags & SENDMAILX) || draftFile ||
+           includeFile || attach || optind < argc)
   {
     FILE *fin = NULL;
     FILE *fout = NULL;
@@ -1280,6 +1280,14 @@ int main (int argc, char **argv, char **environ)
     if (rv)
       goto cleanup_and_exit;
   }
+  /* This guards against invoking `mutt < /dev/null` and accidentally
+   * sending an email due to a my_hdr or other setting.
+   */
+  else if (sendflags & SENDBATCH)
+  {
+    fputs (_("No recipients specified.\n"), stderr);
+    goto cleanup_and_exit;
+  }
   else
   {
     if (!folder)