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diff --git a/lib/email-filter.py b/lib/email-filter.py
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+#!/usr/bin/env python3
+
+# Please prefer the email-gravatar.lua using lua: as a prefix over this script. This
+# script is very slow, in comparison.
+#
+# This script may be used with the email-filter or repo.email-filter settings in cgitrc.
+#
+# The following environment variables can be used to retrieve the configuration
+# of the repository for which this script is called:
+# CGIT_REPO_URL        ( = repo.url       setting )
+# CGIT_REPO_NAME       ( = repo.name      setting )
+# CGIT_REPO_PATH       ( = repo.path      setting )
+# CGIT_REPO_OWNER      ( = repo.owner     setting )
+# CGIT_REPO_DEFBRANCH  ( = repo.defbranch setting )
+# CGIT_REPO_SECTION    ( = section        setting )
+# CGIT_REPO_CLONE_URL  ( = repo.clone-url setting )
+#
+# This simply receives text on stdin and replaces any occurrence of "@" by
+# " _ " to obfuscate emails. Not the most sophisticated algorithm (for now),
+# but laziness and time are two important factors.
+# It still helps with receiving email only from the wealthy Nigerian princes.
+# I need to make money, too.
+
+from sys import stdin
+text = stdin.read().strip()
+text=text.replace("@", " _ ")
+
+print(text)