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diff --git a/email2.md b/email2.md
index 56759f2..9f69ded 100644
--- a/email2.md
+++ b/email2.md
@@ -330,3 +330,14 @@ sufficient detail and clarity to allow independent, inter-operable
 implementations. There should probably be a common test suite for
 conformance, and some dedicated interoperatibility testing.
 
+
+
+SEE ALSO
+=============================================================================
+
+Links to more information, sources, etc.
+
+* Preventing spam on the Fediverse.  Serge Wroclawski. Suggests
+  stamps.
+  - <https://github.com/emacsen/rwot9-prague/blob/ap-unwanted-messages/topics-and-advance-readings/ap-unwanted-messages.md#postage>
+