diff --git a/include/client.h b/include/client.h
index af8ccfa4..d3ff6a57 100644
--- a/include/client.h
+++ b/include/client.h
@@ -452,7 +452,6 @@ struct ListClient
 #define UMODE_SERVICE      0x0040
 #define UMODE_DEAF	   0x0080
 #define UMODE_NOFORWARD    0x0100	/* don't forward */
-#define UMODE_REGONLYMSG   0x0200	/* only allow logged in users to msg */
 
 /* user information flags, only settable by remote mode or local oper */
 #define UMODE_OPER         0x1000	/* Operator */
@@ -543,7 +542,6 @@ struct ListClient
 #define IsService(x)		((x)->umodes & UMODE_SERVICE)
 #define IsDeaf(x)		((x)->umodes & UMODE_DEAF)
 #define IsNoForward(x)		((x)->umodes & UMODE_NOFORWARD)
-#define IsSetRegOnlyMsg(x)	((x)->umodes & UMODE_REGONLYMSG)
 
 #define SetGotId(x)             ((x)->flags |= FLAGS_GOTID)
 #define IsGotId(x)              (((x)->flags & FLAGS_GOTID) != 0)
diff --git a/ircd/newconf.c b/ircd/newconf.c
index 7a540606..b69c3bfc 100644
--- a/ircd/newconf.c
+++ b/ircd/newconf.c
@@ -321,7 +321,6 @@ static struct mode_table umode_table[] = {
 	{"invisible",	UMODE_INVISIBLE	},
 	{"locops",	UMODE_LOCOPS	},
 	{"noforward",	UMODE_NOFORWARD	},
-	{"regonlymsg",	UMODE_REGONLYMSG},
 	{"servnotice",	UMODE_SERVNOTICE},
 	{"wallop",	UMODE_WALLOP	},
 	{"operwall",	UMODE_OPERWALL	},
diff --git a/ircd/s_user.c b/ircd/s_user.c
index 06d3b6cb..5ac5f56e 100644
--- a/ircd/s_user.c
+++ b/ircd/s_user.c
@@ -81,7 +81,7 @@ int user_modes[256] = {
 	0,			/* O */
 	0,			/* P */
 	UMODE_NOFORWARD,	/* Q */
-	UMODE_REGONLYMSG,	/* R */
+	0,			/* R */
 	UMODE_SERVICE,		/* S */
 	0,			/* T */
 	0,			/* U */
diff --git a/modules/Makefile.am b/modules/Makefile.am
index 8b06c829..7f532db7 100644
--- a/modules/Makefile.am
+++ b/modules/Makefile.am
@@ -15,6 +15,7 @@ auto_load_mod_LTLIBRARIES = \
   cap_server_time.la \
   chm_nocolour.la \
   chm_noctcp.la \
+  um_regonlymsg.la \
   m_accept.la \
   m_admin.la \
   m_alias.la \
diff --git a/modules/um_regonlymsg.c b/modules/um_regonlymsg.c
new file mode 100644
index 00000000..75467401
--- /dev/null
+++ b/modules/um_regonlymsg.c
@@ -0,0 +1,129 @@
+/*
+ * modules/um_regonlymsg.c
+ * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "stdinc.h"
+#include "modules.h"
+#include "hook.h"
+#include "client.h"
+#include "ircd.h"
+#include "send.h"
+#include "hash.h"
+#include "s_conf.h"
+#include "s_user.h"
+#include "s_serv.h"
+#include "numeric.h"
+#include "privilege.h"
+#include "s_newconf.h"
+
+static int
+um_regonlymsg_modinit(void)
+{
+	user_modes['R'] = find_umode_slot();
+	construct_umodebuf();
+
+	return 0;
+}
+
+static void
+um_regonlymsg_moddeinit(void)
+{
+	user_modes['R'] = 0;
+	construct_umodebuf();
+}
+
+#define IsSetRegOnlyMsg(c)	((c->umodes & user_modes['R']) == user_modes['R'])
+
+static const char um_regonlymsg_desc[] =
+	"Provides usermode +R which restricts messages from unregistered users.";
+
+static bool
+allow_message(struct Client *source_p, struct Client *target_p)
+{
+	if (!IsSetRegOnlyMsg(target_p))
+		return false;
+
+	if (IsServer(source_p))
+		return false;
+
+	/* XXX: controversial?  allow opers to send through +R */
+	if (IsOper(source_p))
+		return false;
+
+	if (accept_message(source_p, target_p))
+		return false;
+
+	if (source_p->user->suser[0])
+		return false;
+
+	return true;
+}
+
+static void
+h_can_invite(void *vdata)
+{
+	hook_data_channel_approval *data = vdata;
+	struct Client *source_p = data->client;
+	struct Client *target_p = data->target;
+
+	if (allow_message(source_p, target_p))
+		return;
+
+	sendto_one_numeric(source_p, ERR_NONONREG, form_str(ERR_NONONREG),
+			   target_p->name);
+
+	data->approved = ERR_NONONREG;
+}
+
+static void
+h_hdl_privmsg_user(void *vdata)
+{
+	hook_data_privmsg_user *data = vdata;
+	struct Client *source_p = data->source_p;
+	struct Client *target_p = data->target_p;
+
+	if (allow_message(source_p, target_p))
+		return;
+
+	if (data->msgtype == MESSAGE_TYPE_NOTICE)
+		return;
+
+	sendto_one_numeric(source_p, ERR_NONONREG, form_str(ERR_NONONREG),
+			   target_p->name);
+
+	data->approved = ERR_NONONREG;
+}
+
+static mapi_hfn_list_av1 um_regonlymsg_hfnlist[] = {
+	{ "can_invite", h_can_invite },
+	{ "privmsg_user", h_hdl_privmsg_user },
+	{ NULL, NULL }
+};
+
+DECLARE_MODULE_AV2(um_regonlymsg, um_regonlymsg_modinit, um_regonlymsg_moddeinit,
+		   NULL, NULL, um_regonlymsg_hfnlist, NULL, NULL, um_regonlymsg_desc);