diff --git a/app/src/main/java/eu/faircode/email/Core.java b/app/src/main/java/eu/faircode/email/Core.java
index de036a42ae..1cb00388f6 100644
--- a/app/src/main/java/eu/faircode/email/Core.java
+++ b/app/src/main/java/eu/faircode/email/Core.java
@@ -3200,6 +3200,7 @@ class Core {
         boolean sync_quick_pop = prefs.getBoolean("sync_quick_pop", true);
         boolean notify_known = prefs.getBoolean("notify_known", false);
         boolean native_dkim = prefs.getBoolean("native_dkim", false);
+        boolean strict_alignment = prefs.getBoolean("strict_alignment", false);
         boolean download_eml = prefs.getBoolean("download_eml", false);
         boolean download_plain = prefs.getBoolean("download_plain", false);
         boolean check_blocklist = prefs.getBoolean("check_blocklist", false);
@@ -3518,16 +3519,18 @@ class Core {
                                     message.dmarc = true;
                                 else if (message.dmarc != null) {
                                     boolean found = false;
-                                    String asigner = helper.getSigner(authentication);
-                                    String adomain = UriHelper.getRootDomain(context, asigner);
-                                    if (adomain != null)
-                                        for (String signer : signers) {
-                                            String sdomain = UriHelper.getRootDomain(context, signer);
-                                            if (adomain.equalsIgnoreCase(sdomain)) {
-                                                found = true;
-                                                break;
+                                    if (!strict_alignment) {
+                                        String asigner = helper.getSigner(authentication);
+                                        String adomain = UriHelper.getRootDomain(context, asigner);
+                                        if (adomain != null)
+                                            for (String signer : signers) {
+                                                String sdomain = UriHelper.getRootDomain(context, signer);
+                                                if (adomain.equalsIgnoreCase(sdomain)) {
+                                                    found = true;
+                                                    break;
+                                                }
                                             }
-                                        }
+                                    }
                                     if (!found)
                                         message.dmarc = false;
                                 }
@@ -4435,6 +4438,7 @@ class Core {
         boolean download_plain = prefs.getBoolean("download_plain", false);
         boolean notify_known = prefs.getBoolean("notify_known", false);
         boolean native_dkim = prefs.getBoolean("native_dkim", false);
+        boolean strict_alignment = prefs.getBoolean("strict_alignment", false);
         boolean experiments = prefs.getBoolean("experiments", false);
         boolean mdn = prefs.getBoolean("mdn", experiments);
         boolean pro = ActivityBilling.isPro(context);
@@ -4705,16 +4709,18 @@ class Core {
                         message.dmarc = true;
                     else if (message.dmarc != null) {
                         boolean found = false;
-                        String asigner = helper.getSigner(authentication);
-                        String adomain = UriHelper.getRootDomain(context, asigner);
-                        if (adomain != null)
-                            for (String signer : signers) {
-                                String sdomain = UriHelper.getRootDomain(context, signer);
-                                if (adomain.equalsIgnoreCase(sdomain)) {
-                                    found = true;
-                                    break;
+                        if (!strict_alignment) {
+                            String asigner = helper.getSigner(authentication);
+                            String adomain = UriHelper.getRootDomain(context, asigner);
+                            if (adomain != null)
+                                for (String signer : signers) {
+                                    String sdomain = UriHelper.getRootDomain(context, signer);
+                                    if (adomain.equalsIgnoreCase(sdomain)) {
+                                        found = true;
+                                        break;
+                                    }
                                 }
-                            }
+                        }
                         if (!found)
                             message.dmarc = false;
                     }
diff --git a/app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java b/app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java
index d4b2d35c61..c9d3277f22 100644
--- a/app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java
+++ b/app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java
@@ -217,6 +217,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
     private SwitchCompat swNativeDkim;
     private SwitchCompat swNativeArc;
     private EditText etNativeArcWhitelist;
+    private SwitchCompat swStrictAlignment;
     private SwitchCompat swWebp;
     private SwitchCompat swAnimate;
     private SwitchCompat swEasyCorrect;
@@ -294,7 +295,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             "keep_alive_poll", "empty_pool", "idle_done", "fast_fetch",
             "max_backoff_power", "logarithmic_backoff",
             "exact_alarms",
-            "native_dkim", "native_arc", "native_arc_whitelist",
+            "native_dkim", "native_arc", "native_arc_whitelist", "strict_alignment",
             "webp", "animate_images",
             "easy_correct", "paste_plain", "infra", "tld_flags", "json_ld", "dup_msgids", "thread_byref", "save_user_flags", "mdn",
             "app_chooser", "app_chooser_share", "adjacent_links", "adjacent_documents", "adjacent_portrait", "adjacent_landscape",
@@ -465,6 +466,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         swNativeDkim = view.findViewById(R.id.swNativeDkim);
         swNativeArc = view.findViewById(R.id.swNativeArc);
         etNativeArcWhitelist = view.findViewById(R.id.etNativeArcWhitelist);
+        swStrictAlignment = view.findViewById(R.id.swStrictAlignment);
         swWebp = view.findViewById(R.id.swWebp);
         swAnimate = view.findViewById(R.id.swAnimate);
         swEasyCorrect = view.findViewById(R.id.swEasyCorrect);
@@ -1525,6 +1527,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
                 prefs.edit().putBoolean("native_dkim", checked).apply();
                 swNativeArc.setEnabled(checked && swNativeDkim.isEnabled());
                 etNativeArcWhitelist.setEnabled(checked && swNativeDkim.isEnabled());
+                swStrictAlignment.setEnabled(checked && swNativeDkim.isEnabled());
             }
         });
 
@@ -1553,6 +1556,13 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             }
         });
 
+        swStrictAlignment.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("strict_alignment", checked).apply();
+            }
+        });
+
         swWebp.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@@ -2419,6 +2429,8 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             swNativeArc.setChecked(prefs.getBoolean("native_arc", true));
             etNativeArcWhitelist.setEnabled(swNativeDkim.isEnabled() && swNativeDkim.isChecked());
             etNativeArcWhitelist.setText(prefs.getString("native_arc_whitelist", null));
+            swStrictAlignment.setChecked(prefs.getBoolean("strict_alignment", false));
+            swStrictAlignment.setEnabled(swNativeDkim.isEnabled() && swNativeDkim.isChecked());
             swWebp.setChecked(prefs.getBoolean("webp", true));
             swAnimate.setChecked(prefs.getBoolean("animate_images", true));
             swEasyCorrect.setChecked(prefs.getBoolean("easy_correct", false));
diff --git a/app/src/main/res/layout/fragment_options_misc.xml b/app/src/main/res/layout/fragment_options_misc.xml
index 5c3d80d8dc..33cc94a885 100644
--- a/app/src/main/res/layout/fragment_options_misc.xml
+++ b/app/src/main/res/layout/fragment_options_misc.xml
@@ -1603,6 +1603,18 @@
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toBottomOf="@id/swNativeArc" />
 
+                <androidx.appcompat.widget.SwitchCompat
+                    android:id="@+id/swStrictAlignment"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="12dp"
+                    android:layout_marginTop="12dp"
+                    android:text="@string/title_advanced_strict_alignment"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toBottomOf="@id/etNativeArcWhitelist"
+                    app:switchPadding="12dp" />
+
                 <androidx.appcompat.widget.SwitchCompat
                     android:id="@+id/swWebp"
                     android:layout_width="0dp"
@@ -1611,7 +1623,7 @@
                     android:text="@string/title_advanced_webp"
                     app:layout_constraintEnd_toEndOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toBottomOf="@id/etNativeArcWhitelist"
+                    app:layout_constraintTop_toBottomOf="@id/swStrictAlignment"
                     app:switchPadding="12dp" />
 
                 <androidx.appcompat.widget.SwitchCompat
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 35b86e8e2e..7f31182451 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -965,6 +965,7 @@
     <string name="title_advanced_exact_alarms" translatable="false">Use exact timers</string>
     <string name="title_advanced_native_dkim" translatable="false">Native DKIM verification</string>
     <string name="title_advanced_native_arc" translatable="false">Native ARC verification</string>
+    <string name="title_advanced_strict_alignment" translatable="false">Strict alignment</string>
     <string name="title_advanced_webp" translatable="false">WebP</string>
     <string name="title_advanced_animate" translatable="false">Animate images (GIF, etc.)</string>
     <string name="title_advanced_easy_correct" translatable="false">Easy correct</string>