Update fredrick to reply to mailing lists correctly

Author: jb3

ansible/roles/postfix/templates/services/fredrick-reply.sh.j2

@@ -33,11 +33,20 @@ ORIGINAL_SUBJECT=$(echo "$EMAIL" | mhdr -h subject -)
 LIST_ID=$(echo "$EMAIL" | mhdr -h list-id -)
 if [ "$LIST_ID" != "" ]; then
     # We don't reply to all mailing list posts.
-    SHOULD_REPLY=$(awk 'BEGIN { srand(); print rand() <= 0.25 }')
+    SHOULD_REPLY=$(awk 'BEGIN { srand(); print rand() <= 0.75 }')
     if [ "$SHOULD_REPLY" = "0" ]; then
         echo "fredrick: don't feel like replying to mailing list post (\"$ORIGINAL_SUBJECT\")."
         exit 0
     fi
+
+    # If we're replying to a mailing list, the recipient should actually be the list address
+    RECIPIENT=$(echo "$EMAIL" | maddr -a -h x-original-to -)
+
+    # If we couldn't find the original recipient, abort here
+    if [ "$RECIPIENT" = "" ]; then
+        echo "fredrick: couldn't determine original recipient for mailing list post (\"$ORIGINAL_SUBJECT\")."
+        exit 0
+    fi
 fi
 
 # Construct the reply subject