Add GNU Mailman

Abhilash Raj · maxking · commit 9340c387d800 · 2021-03-27T13:43:38.000-07:00
diff --git a/index.md b/index.md
@@ -70,6 +70,7 @@ Signed,
 1. GlobaLeaks
 1. GNOME Foundation
 1. GNU Radio
+1. GNU Mailman
 1. Great Scott Gadgets
 1. Innatical
 1. Kludge Cyber Systems
