diff --git a/app/src/main/java/eu/faircode/email/EntityRule.java b/app/src/main/java/eu/faircode/email/EntityRule.java
index b36e9bc119..3e25cb4e66 100644
--- a/app/src/main/java/eu/faircode/email/EntityRule.java
+++ b/app/src/main/java/eu/faircode/email/EntityRule.java
@@ -19,11 +19,16 @@ package eu.faircode.email;
     Copyright 2018-2019 by Marcel Bokhorst (M66B)
 */
 
+import android.Manifest;
 import android.content.Context;
 import android.content.Intent;
+import android.content.SharedPreferences;
+import android.database.Cursor;
 import android.net.Uri;
+import android.provider.ContactsContract;
 
 import androidx.annotation.NonNull;
+import androidx.preference.PreferenceManager;
 import androidx.room.Entity;
 import androidx.room.ForeignKey;
 import androidx.room.Index;
@@ -102,16 +107,51 @@ public class EntityRule {
             if (jsender != null) {
                 String value = jsender.getString("value");
                 boolean regex = jsender.getBoolean("regex");
+                boolean known = jsender.optBoolean("known");
 
                 boolean matches = false;
                 if (message.from != null) {
                     for (Address from : message.from) {
                         InternetAddress ia = (InternetAddress) from;
+                        String email = ia.getAddress();
                         String personal = ia.getPersonal();
-                        String formatted = ((personal == null ? "" : personal + " ") + "<" + ia.getAddress() + ">");
-                        if (matches(context, value, formatted, regex)) {
-                            matches = true;
-                            break;
+
+                        if (known) {
+                            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+                            boolean suggest_sent = prefs.getBoolean("suggest_sent", false);
+                            if (suggest_sent) {
+                                DB db = DB.getInstance(context);
+                                EntityContact contact =
+                                        db.contact().getContact(message.account, EntityContact.TYPE_TO, email);
+                                if (contact != null) {
+                                    Log.i(email + " is local contact");
+                                    matches = true;
+                                    break;
+                                }
+                            }
+
+                            boolean contacts = Helper.hasPermission(context, Manifest.permission.READ_CONTACTS);
+                            if (contacts) {
+                                Cursor cursor = context.getContentResolver().query(
+                                        ContactsContract.CommonDataKinds.Email.CONTENT_URI,
+                                        new String[]{ContactsContract.CommonDataKinds.Email.CONTACT_ID},
+                                        ContactsContract.CommonDataKinds.Email.DATA + " = ? COLLATE NOCASE",
+                                        new String[]{email},
+                                        null);
+
+                                while (cursor != null && cursor.moveToNext()) {
+                                    Log.i(email + " is Android contact");
+                                    matches = true;
+                                    break;
+                                }
+                            }
+
+                        } else {
+                            String formatted = ((personal == null ? "" : personal + " ") + "<" + email + ">");
+                            if (matches(context, value, formatted, regex)) {
+                                matches = true;
+                                break;
+                            }
                         }
                     }
                 }
diff --git a/app/src/main/java/eu/faircode/email/FragmentRule.java b/app/src/main/java/eu/faircode/email/FragmentRule.java
index bf318e9d64..c4c221813f 100644
--- a/app/src/main/java/eu/faircode/email/FragmentRule.java
+++ b/app/src/main/java/eu/faircode/email/FragmentRule.java
@@ -40,6 +40,7 @@ import android.widget.AdapterView;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.CheckBox;
+import android.widget.CompoundButton;
 import android.widget.EditText;
 import android.widget.ImageButton;
 import android.widget.ImageView;
@@ -89,6 +90,7 @@ public class FragmentRule extends FragmentBase {
     private EditText etSender;
     private CheckBox cbSender;
     private ImageView ibSender;
+    private CheckBox cbKnownSender;
 
     private EditText etRecipient;
     private CheckBox cbRecipient;
@@ -192,6 +194,7 @@ public class FragmentRule extends FragmentBase {
         etSender = view.findViewById(R.id.etSender);
         cbSender = view.findViewById(R.id.cbSender);
         ibSender = view.findViewById(R.id.ibSender);
+        cbKnownSender = view.findViewById(R.id.cbKnownSender);
 
         etRecipient = view.findViewById(R.id.etRecipient);
         cbRecipient = view.findViewById(R.id.cbRecipient);
@@ -252,6 +255,15 @@ public class FragmentRule extends FragmentBase {
             }
         });
 
+        cbKnownSender.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                etSender.setEnabled(!isChecked);
+                ibSender.setEnabled(!isChecked);
+                cbSender.setEnabled(!isChecked);
+            }
+        });
+
         ibRecipient.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -628,6 +640,10 @@ public class FragmentRule extends FragmentBase {
 
                     etSender.setText(jsender == null ? args.getString("sender") : jsender.getString("value"));
                     cbSender.setChecked(jsender != null && jsender.getBoolean("regex"));
+                    cbKnownSender.setChecked(jsender != null && jsender.optBoolean("known"));
+                    etSender.setEnabled(!cbKnownSender.isChecked());
+                    ibSender.setEnabled(!cbKnownSender.isChecked());
+                    cbSender.setEnabled(!cbKnownSender.isChecked());
 
                     etRecipient.setText(jrecipient == null ? args.getString("recipient") : jrecipient.getString("value"));
                     cbRecipient.setChecked(jrecipient != null && jrecipient.getBoolean("regex"));
@@ -877,10 +893,12 @@ public class FragmentRule extends FragmentBase {
         JSONObject jcondition = new JSONObject();
 
         String sender = etSender.getText().toString();
-        if (!TextUtils.isEmpty(sender)) {
+        boolean known = cbKnownSender.isChecked();
+        if (!TextUtils.isEmpty(sender) || known) {
             JSONObject jsender = new JSONObject();
             jsender.put("value", sender);
             jsender.put("regex", cbSender.isChecked());
+            jsender.put("known", known);
             jcondition.put("sender", jsender);
         }
 
diff --git a/app/src/main/res/layout/fragment_rule.xml b/app/src/main/res/layout/fragment_rule.xml
index 8f3bd8c9d2..b7d0228725 100644
--- a/app/src/main/res/layout/fragment_rule.xml
+++ b/app/src/main/res/layout/fragment_rule.xml
@@ -160,6 +160,14 @@
                 app:layout_constraintTop_toTopOf="@id/etSender"
                 app:srcCompat="@drawable/baseline_person_add_24" />
 
+            <CheckBox
+                android:id="@+id/cbKnownSender"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/title_rule_sender_known"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/etSender" />
+
             <TextView
                 android:id="@+id/tvAndSender"
                 android:layout_width="wrap_content"
@@ -170,7 +178,7 @@
                 android:textColor="?android:attr/textColorPrimary"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintTop_toBottomOf="@+id/etSender" />
+                app:layout_constraintTop_toBottomOf="@+id/cbKnownSender" />
 
             <View
                 android:id="@+id/vSeparatorRecipient"
@@ -615,7 +623,7 @@
                 android:layout_height="0dp"
                 app:constraint_referenced_ids="
                     tvTitle,tvFolder,tvName,etName,tvOrder,etOrder,cbEnabled,cbStop,
-                    vSeparatorSender,tvSender,cbSender,etSender,ibSender,tvAndSender,
+                    vSeparatorSender,tvSender,cbSender,etSender,ibSender,cbKnownSender,tvAndSender,
                     vSeparatorRecipient,tvRecipient,cbRecipient,etRecipient,ibRecipient,tvAndRecipient,
                     vSeparatorSubject,tvSubject,cbSubject,etSubject,tvAndSubject,
                     vSeparatorHeader,tvHeader,cbHeader,etHeader,tvAndHeader,
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 8e67e17338..581ff796ca 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -665,6 +665,7 @@
     <string name="title_rule_enabled">Enabled</string>
     <string name="title_rule_stop">Stop processing rules after executing this rule</string>
     <string name="title_rule_sender">Sender contains</string>
+    <string name="title_rule_sender_known">Sender is a contact</string>
     <string name="title_rule_recipient">Recipient contains</string>
     <string name="title_rule_subject">Subject contains</string>
     <string name="title_rule_header">Header contains</string>