diff --git a/app/src/main/java/eu/faircode/email/EntityMessage.java b/app/src/main/java/eu/faircode/email/EntityMessage.java
index df895b0354..e18d653631 100644
--- a/app/src/main/java/eu/faircode/email/EntityMessage.java
+++ b/app/src/main/java/eu/faircode/email/EntityMessage.java
@@ -104,7 +104,7 @@ public class EntityMessage implements Serializable {
 
     static final Integer DSN_NONE = 0;
     static final Integer DSN_RECEIPT = 1;
-    static final Integer DSN_ADDRESS_UNKNOWN = 2;
+    static final Integer DSN_HARD_BOUNCE = 2;
 
     static final Long SWIPE_ACTION_ASK = -1L;
     static final Long SWIPE_ACTION_SEEN = -2L;
diff --git a/app/src/main/java/eu/faircode/email/FragmentCompose.java b/app/src/main/java/eu/faircode/email/FragmentCompose.java
index 0581f4d487..6e97f016e4 100644
--- a/app/src/main/java/eu/faircode/email/FragmentCompose.java
+++ b/app/src/main/java/eu/faircode/email/FragmentCompose.java
@@ -3626,7 +3626,7 @@ public class FragmentCompose extends FragmentBase {
                                 if (EntityMessage.DSN_RECEIPT.equals(dsn)) {
                                     if (ref.receipt_to != null)
                                         data.draft.to = ref.receipt_to;
-                                } else if (EntityMessage.DSN_ADDRESS_UNKNOWN.equals(dsn)) {
+                                } else if (EntityMessage.DSN_HARD_BOUNCE.equals(dsn)) {
                                     if (ref.return_path != null)
                                         data.draft.to = ref.return_path;
                                     else if (BuildConfig.DEBUG)
@@ -3741,14 +3741,14 @@ public class FragmentCompose extends FragmentBase {
                         } else if ("list".equals(action)) {
                             data.draft.subject = ref.subject;
                         } else if ("dsn".equals(action)) {
-                            if (EntityMessage.DSN_ADDRESS_UNKNOWN.equals(dsn))
-                                data.draft.subject = context.getString(R.string.title_address_unknown_subject);
+                            if (EntityMessage.DSN_HARD_BOUNCE.equals(dsn))
+                                data.draft.subject = context.getString(R.string.title_hard_bounce_subject);
                             else
                                 data.draft.subject = context.getString(R.string.title_receipt_subject, subject);
 
                             String[] texts;
-                            if (EntityMessage.DSN_ADDRESS_UNKNOWN.equals(dsn))
-                                texts = new String[]{context.getString(R.string.title_address_unknown_text)};
+                            if (EntityMessage.DSN_HARD_BOUNCE.equals(dsn))
+                                texts = new String[]{context.getString(R.string.title_hard_bounce_text)};
                             else
                                 texts = Helper.getStrings(context, ref.language, R.string.title_receipt_text);
                             for (int i = 0; i < texts.length; i++) {
diff --git a/app/src/main/java/eu/faircode/email/FragmentMessages.java b/app/src/main/java/eu/faircode/email/FragmentMessages.java
index 2d2abe7796..6ef4d2f41f 100644
--- a/app/src/main/java/eu/faircode/email/FragmentMessages.java
+++ b/app/src/main/java/eu/faircode/email/FragmentMessages.java
@@ -2431,7 +2431,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                 popupMenu.getMenu().findItem(R.id.menu_reply_to_all).setVisible(recipients.length > 0);
                 popupMenu.getMenu().findItem(R.id.menu_reply_list).setVisible(message.list_post != null);
                 popupMenu.getMenu().findItem(R.id.menu_reply_receipt).setVisible(message.receipt_to != null);
-                popupMenu.getMenu().findItem(R.id.menu_reply_address_unknown)
+                popupMenu.getMenu().findItem(R.id.menu_reply_hard_bounce)
                         .setVisible(experiments && (BuildConfig.DEBUG ||
                                 (message.return_path != null && message.return_path.length > 0)));
                 popupMenu.getMenu().findItem(R.id.menu_new_message).setVisible(to != null && to.length > 0);
@@ -2477,8 +2477,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                             case R.id.menu_reply_receipt:
                                 onMenuDsn(message, EntityMessage.DSN_RECEIPT);
                                 return true;
-                            case R.id.menu_reply_address_unknown:
-                                onMenuDsn(message, EntityMessage.DSN_ADDRESS_UNKNOWN);
+                            case R.id.menu_reply_hard_bounce:
+                                onMenuDsn(message, EntityMessage.DSN_HARD_BOUNCE);
                                 return true;
                             case R.id.menu_forward:
                                 onMenuReply(message, "forward");
diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index b946141c5a..655dcbb34e 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -575,7 +575,7 @@ public class MessageHelper {
 
             imessage.setContent(report);
             return;
-        } else if (EntityMessage.DSN_ADDRESS_UNKNOWN.equals(message.dsn)) {
+        } else if (EntityMessage.DSN_HARD_BOUNCE.equals(message.dsn)) {
             // https://tools.ietf.org/html/rfc3464
             Multipart report = new MimeMultipart("report; report-type=delivery-status");
 
diff --git a/app/src/main/res/menu/popup_reply.xml b/app/src/main/res/menu/popup_reply.xml
index b516dd14f4..6b6b8c6906 100644
--- a/app/src/main/res/menu/popup_reply.xml
+++ b/app/src/main/res/menu/popup_reply.xml
@@ -17,8 +17,8 @@
         android:title="@string/title_reply_receipt" />
 
     <item
-        android:id="@+id/menu_reply_address_unknown"
-        android:title="@string/title_reply_address_unknown" />
+        android:id="@+id/menu_reply_hard_bounce"
+        android:title="@string/title_reply_hard_bounce" />
 
     <item
         android:id="@+id/menu_forward"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index f276d39f97..adea2f7212 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -887,7 +887,7 @@
     <string name="title_reply_to_all">Reply to all</string>
     <string name="title_reply_list">Reply to list</string>
     <string name="title_reply_receipt">Send read receipt</string>
-    <string name="title_reply_address_unknown">Report \'address unknown\'</string>
+    <string name="title_reply_hard_bounce">Send hard bounce</string>
     <string name="title_reply_template">Reply with template</string>
     <string name="title_move_undo">Moving to %1$s (%2$d)</string>
     <string name="title_open_with">Open with</string>
@@ -896,8 +896,8 @@
     <string name="title_receipt_subject">Read receipt: %1$s</string>
     <string name="title_receipt_text">This read receipt only acknowledges that the message was displayed. There is no guarantee that the recipient has read the message contents.</string>
 
-    <string name="title_address_unknown_subject" translatable="false">Delivery Status Notification (Failure)</string>
-    <string name="title_address_unknown_text" translatable="false">Your message wasn\'t delivered because the address couldn\'t be found.</string>
+    <string name="title_hard_bounce_subject" translatable="false">Delivery Status Notification (Failure)</string>
+    <string name="title_hard_bounce_text" translatable="false">Your message wasn\'t delivered because the address couldn\'t be found.</string>
 
     <string name="title_no_answers">No reply templates defined</string>
     <string name="title_no_viewer">No viewer app available for %1$s</string>