diff --git a/irctest/controllers/ergo.py b/irctest/controllers/ergo.py
index 5655e82..df71787 100644
--- a/irctest/controllers/ergo.py
+++ b/irctest/controllers/ergo.py
@@ -77,6 +77,9 @@ BASE_CONFIG = {
         "channel-length": 128,
         "client-length": 128,
         "chathistory-maxmessages": 100,
+        "retention": {
+            "allow-individual-delete": True,
+        },
         "tagmsg-storage": {
             "default": False,
             "whitelist": ["+draft/persist", "+persist"],
diff --git a/irctest/server_tests/redaction.py b/irctest/server_tests/redaction.py
new file mode 100644
index 0000000..675c5ef
--- /dev/null
+++ b/irctest/server_tests/redaction.py
@@ -0,0 +1,132 @@
+"""
+`IRCv3 draft message redaction <https://github.com/progval/ircv3-specifications/blob/redaction/extensions/message-redaction.md>`_
+"""
+
+from irctest import cases
+from irctest.patma import ANYDICT, ANYSTR, StrRe
+
+CAPABILITIES = [
+    "message-tags",
+    "echo-message",
+    "labeled-response",
+    "draft/message-redaction",
+]
+
+
+@cases.mark_specifications("IRCv3")
+@cases.mark_capabilities(*CAPABILITIES)
+class RedactTestCase(cases.BaseServerTestCase):
+    def _setupRedactTest(self, redacteeId, redacteeNick):
+        self.connectClient("chanop", capabilities=CAPABILITIES, skip_if_cap_nak=True)
+        self.sendLine(1, "JOIN #chan")
+        self.connectClient("user", capabilities=CAPABILITIES, skip_if_cap_nak=True)
+        self.sendLine(2, "JOIN #chan")
+        self.getMessages(2)  # synchronize
+        self.getMessages(1)
+
+        self.sendLine(redacteeId, "@label=1234 PRIVMSG #chan :hello there")
+        echo = self.getMessage(redacteeId)
+        self.assertMessageMatch(
+            echo,
+            tags={"label": "1234", "msgid": StrRe("[^ ]+"), **ANYDICT},
+            prefix=StrRe(redacteeNick + "!.*"),
+            command="PRIVMSG",
+            params=["#chan", "hello there"],
+        )
+        msgid = echo.tags["msgid"]
+
+        self.assertMessageMatch(
+            self.getMessage(3 - redacteeId),
+            tags={"msgid": msgid, **ANYDICT},
+            prefix=StrRe(redacteeNick + "!.*"),
+            command="PRIVMSG",
+            params=["#chan", "hello there"],
+        )
+
+        return msgid
+
+    def testRelayOpSelfRedact(self):
+        """Channel op writes a message and redacts it themselves."""
+        msgid = self._setupRedactTest(redacteeId=1, redacteeNick="chanop")
+
+        self.sendLine(1, f"REDACT #chan {msgid} :oops")
+        self.assertMessageMatch(
+            self.getMessage(1),
+            prefix=StrRe("chanop!.*"),
+            command="REDACT",
+            params=["#chan", msgid, "oops"],
+        )
+
+        self.assertMessageMatch(
+            self.getMessage(2),
+            prefix=StrRe("chanop!.*"),
+            command="REDACT",
+            params=["#chan", msgid, "oops"],
+        )
+
+    def testRelayOpRedact(self):
+        """User writes a message and channel op redacts it."""
+        msgid = self._setupRedactTest(
+            redacteeId=2,
+            redacteeNick="user",
+        )
+
+        self.sendLine(1, f"REDACT #chan {msgid} :spam")
+        self.assertMessageMatch(
+            self.getMessage(1),
+            prefix=StrRe("chanop!.*"),
+            command="REDACT",
+            params=["#chan", msgid, "spam"],
+        )
+
+        self.assertMessageMatch(
+            self.getMessage(2),
+            prefix=StrRe("chanop!.*"),
+            command="REDACT",
+            params=["#chan", msgid, "spam"],
+        )
+
+    def testRelayUserSelfRedact(self):
+        """User writes a message and redacts it themselves.
+
+        Servers may either accept or reject this."""
+        msgid = self._setupRedactTest(redacteeId=2, redacteeNick="user")
+
+        self.sendLine(2, f"REDACT #chan {msgid} :oops")
+
+        msg = self.getMessage(2)
+        if msg.command == "REDACT":
+            self.assertMessageMatch(
+                msg,
+                prefix=StrRe("user!.*"),
+                command="REDACT",
+                params=["#chan", msgid, "oops"],
+            )
+
+            self.assertMessageMatch(
+                self.getMessage(1),
+                prefix=StrRe("user!.*"),
+                command="REDACT",
+                params=["#chan", msgid, "oops"],
+            )
+        else:
+            self.assertMessageMatch(
+                msg,
+                command="FAIL",
+                params=["REDACT", "REDACT_FORBIDDEN", "#chan", msgid, ANYSTR],
+            )
+
+            self.assertEqual(self.getMessages(1), [])
+
+    def testRejectRedactOtherUser(self):
+        """Channel op writes a message and a user attempts to redact it."""
+        msgid = self._setupRedactTest(redacteeId=1, redacteeNick="chanop")
+
+        self.sendLine(2, f"REDACT #chan {msgid} :oops")
+        self.assertMessageMatch(
+            self.getMessage(2),
+            command="FAIL",
+            params=["REDACT", "REDACT_FORBIDDEN", "#chan", msgid, ANYSTR],
+        )
+
+        self.assertEqual(self.getMessages(1), [])
diff --git a/irctest/specifications.py b/irctest/specifications.py
index 9c4617b..e853347 100644
--- a/irctest/specifications.py
+++ b/irctest/specifications.py
@@ -35,6 +35,7 @@ class Capabilities(enum.Enum):
     EXTENDED_JOIN = "extended-join"
     EXTENDED_MONITOR = "extended-monitor"
     LABELED_RESPONSE = "labeled-response"
+    MESSAGE_REDACTION = "draft/message-redaction"
     MESSAGE_TAGS = "message-tags"
     MULTILINE = "draft/multiline"
     MULTI_PREFIX = "multi-prefix"
diff --git a/pytest.ini b/pytest.ini
index 375f2bb..4b3f5ef 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -26,6 +26,7 @@ markers =
     extended-join
     extended-monitor
     labeled-response
+    draft/message-redaction
     message-tags
     draft/multiline
     multi-prefix