Allow external emails to send

postfix/sender_access

@@ -0,0 +1,10 @@
+# Sender access control for mailing lists
+# Format: sender_address ACTION
+# Actions: OK (allow), REJECT (block with message), DISCARD (silently drop)
+
+# Allow all board members from sasalliance.org domain
+sasalliance.org    OK
+
+# Add other authorized senders as needed
+# user@external.com    OK
+# anotherdomain.com    OK