From 0660e7f17ee74f9bf4cbc677155b424be6100276 Mon Sep 17 00:00:00 2001
From: twesterhever <40121680+twesterhever@users.noreply.github.com>
Date: Tue, 9 Apr 2024 11:13:15 +0000
Subject: [Enhancement] Detect freemail and disposable e-mail usage for MDN

---
 conf/modules.d/multimap.conf | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'conf')

diff --git a/conf/modules.d/multimap.conf b/conf/modules.d/multimap.conf
index b707ddfb1..0b43b6ca9 100644
--- a/conf/modules.d/multimap.conf
+++ b/conf/modules.d/multimap.conf
@@ -85,6 +85,16 @@ multimap {
     score = 0.0;
   }
 
+  freemail_mdn {
+    type = "header";
+    header = "Disposition-Notification-To";
+    filter = "email:domain";
+    map = "https://maps.rspamd.com/freemail/free.txt.zst";
+    symbol = "FREEMAIL_MDN";
+    description = "Disposition-Notification-To is a Freemail address";
+    score = 0.0;
+  }
+
   # Disposable Addresses
   disposable_envfrom {
     type = "from";
@@ -147,6 +157,16 @@ multimap {
     score = 0.0;
   }
 
+  disposable_mdn {
+    type = "header";
+    header = "Disposition-Notification-To";
+    filter = "email:domain";
+    map = "https://maps.rspamd.com/freemail/disposable.txt.zst";
+    symbol = "DISPOSABLE_MDN";
+    description = "Disposition-Notification-To is a disposable e-mail address";
+    score = 0.5;
+  }
+
   .include(try=true,priority=5) "${DBDIR}/dynamic/multimap.conf"
   .include(try=true,priority=1,duplicate=merge) "$LOCAL_CONFDIR/local.d/multimap.conf"
   .include(try=true,priority=10) "$LOCAL_CONFDIR/override.d/multimap.conf"
-- 
cgit v1.2.3


From da1401b3f5ee438ff4b94d8e7fecb686309e1577 Mon Sep 17 00:00:00 2001
From: twesterhever <40121680+twesterhever@users.noreply.github.com>
Date: Tue, 9 Apr 2024 11:14:16 +0000
Subject: [Minor] Improve FREEMAIL_AFF detection

---
 conf/composites.conf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'conf')

diff --git a/conf/composites.conf b/conf/composites.conf
index e38d64e6b..a36d0449f 100644
--- a/conf/composites.conf
+++ b/conf/composites.conf
@@ -163,7 +163,7 @@ composites {
     group = "scams";
   }
   FREEMAIL_AFF {
-    expression = "(FREEMAIL_FROM | FREEMAIL_ENVFROM | FREEMAIL_REPLYTO) & (TO_DN_RECIPIENTS | R_UNDISC_RCPT) & (INTRODUCTION | FROM_NAME_HAS_TITLE | FREEMAIL_REPLYTO_NEQ_FROM_DOM | SUBJECT_HAS_CURRENCY)";
+    expression = "(FREEMAIL_FROM | FREEMAIL_ENVFROM | FREEMAIL_REPLYTO | FREEMAIL_MDN) & (TO_DN_RECIPIENTS | R_UNDISC_RCPT) & (INTRODUCTION | FROM_NAME_HAS_TITLE | FREEMAIL_REPLYTO_NEQ_FROM_DOM | SUBJECT_HAS_CURRENCY)";
     score = 4.0;
     policy = "leave";
     description = "Message exhibits strong characteristics of advance fee fraud (AFF a/k/a '419' spam) involving freemail addresses";
-- 
cgit v1.2.3


From 89f1c81a275993e83991a0ea7a87e58404f1839e Mon Sep 17 00:00:00 2001
From: twesterhever <40121680+twesterhever@users.noreply.github.com>
Date: Tue, 9 Apr 2024 11:17:33 +0000
Subject: [Minor] Add composite for suspicios free/disposamail MDN usage

---
 conf/composites.conf | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'conf')

diff --git a/conf/composites.conf b/conf/composites.conf
index a36d0449f..da14ce3a5 100644
--- a/conf/composites.conf
+++ b/conf/composites.conf
@@ -168,6 +168,13 @@ composites {
     policy = "leave";
     description = "Message exhibits strong characteristics of advance fee fraud (AFF a/k/a '419' spam) involving freemail addresses";
   }
+  SUSPICIOS_MDN {
+    expression = "(FREEMAIL_MDN | DISPOSABLE_MDN) & !(FREEMAIL_FROM | FREEMAIL_ENVFROM)";
+    score = 2.0;
+    policy = "leave";
+    description = "Message delivery notification should go to freemail or disposable e-mail, but message was not sent from a freemail address";
+    group = "scams";
+  }
   REDIRECTOR_URL_ONLY {
     expression = "HFILTER_URL_ONLY & REDIRECTOR_URL";
     score = 1.0;
-- 
cgit v1.2.3


From e4fcdfd2765c57d356f2e38d4f24b95ebef15550 Mon Sep 17 00:00:00 2001
From: twesterhever <40121680+twesterhever@users.noreply.github.com>
Date: Tue, 9 Apr 2024 11:19:11 +0000
Subject: [Minor] Fix typo in rule name

---
 conf/composites.conf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'conf')

diff --git a/conf/composites.conf b/conf/composites.conf
index da14ce3a5..d3c4f073b 100644
--- a/conf/composites.conf
+++ b/conf/composites.conf
@@ -168,7 +168,7 @@ composites {
     policy = "leave";
     description = "Message exhibits strong characteristics of advance fee fraud (AFF a/k/a '419' spam) involving freemail addresses";
   }
-  SUSPICIOS_MDN {
+  SUSPICIOUS_MDN {
     expression = "(FREEMAIL_MDN | DISPOSABLE_MDN) & !(FREEMAIL_FROM | FREEMAIL_ENVFROM)";
     score = 2.0;
     policy = "leave";
-- 
cgit v1.2.3