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app/src/main/java/eu/faircode/email/DaoMessage.java

@@ -468,6 +468,11 @@ public interface DaoMessage {
             " AND (:to IS NULL OR received IS NULL OR received < :to)")
     List<TupleThreadInfo> getThreadInfo(long account, List<String> msgids, Long from, Long to);
 
+    @Query("SELECT * FROM message" +
+            " WHERE folder = :folder" +
+            " AND sender = :sender")
+    List<EntityMessage> getMessagesBySender(long folder, String sender);
+
     @Query("SELECT * FROM message" +
             " WHERE account = :account" +
             " AND sender = :sender" +

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -10956,9 +10956,18 @@ public class FragmentMessages extends FragmentBase
                     if (junk == null)
                         throw new IllegalArgumentException(context.getString(R.string.title_no_junk_folder));
 
-                    if (!message.folder.equals(junk.id))
+                    if (!message.folder.equals(junk.id)) {
                         EntityOperation.queue(context, message, EntityOperation.MOVE, junk.id, null, null, true);
 
+                        if (!Helper.isPlayStoreInstall()) {
+                            List<EntityMessage> similar = db.message().getMessagesBySender(message.folder, message.sender);
+                            if (similar != null)
+                                for (EntityMessage m : similar)
+                                    if (!message.id.equals(m.id))
+                                        EntityOperation.queue(context, m, EntityOperation.MOVE, junk.id, null, null, true);
+                        }
+                    }
+
                     if (block_domain) {
                         List<EntityRule> rules = EntityRule.blockSender(context, message, junk, block_domain);
                         for (EntityRule rule : rules) {