Enabled Spamhaus/DBL

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

@@ -3392,8 +3392,17 @@ class Core {
                     !EntityFolder.JUNK.equals(folder.type) &&
                     !Arrays.asList(message.keywords).contains(MessageHelper.FLAG_NOT_JUNK))
                 try {
-                    message.blocklist = DnsBlockList.isJunk(
-                            context, imessage.getHeader("Received"));
+                    message.blocklist = DnsBlockList.isJunk(context,
+                            imessage.getHeader("Received"));
+
+                    if (message.blocklist == null || !message.blocklist) {
+                        List<Address> senders = new ArrayList<>();
+                        if (message.reply != null)
+                            senders.addAll(Arrays.asList(message.reply));
+                        if (message.from != null)
+                            senders.addAll(Arrays.asList(message.from));
+                        message.blocklist = DnsBlockList.isJunk(context, senders);
+                    }
                 } catch (Throwable ex) {
                     Log.w(folder.name, ex);
                 }

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

@@ -39,6 +39,8 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 
+import javax.mail.Address;
+import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeUtility;
 
 public class DnsBlockList {
@@ -55,7 +57,7 @@ public class DnsBlockList {
             }),
 
             // https://www.spamhaus.org/dbl/
-            new BlockList(null, "Spamhaus/DBL", "dbl.spamhaus.org", false, new String[]{
+            new BlockList(true, "Spamhaus/DBL", "dbl.spamhaus.org", false, new String[]{
                     // https://www.spamhaus.org/faq/section/Spamhaus%20DBL#291
                     "127.0.1.2", // spam domain
                     "127.0.1.4", // phish domain
@@ -137,10 +139,28 @@ public class DnsBlockList {
             return null;
 
         String host = getFromHost(MimeUtility.unfold(received[received.length - 1]));
-        return (host == null ? null : isJunk(context, host, BLOCK_LISTS));
+        if (host == null)
+            return null;
+        boolean numeric = host.startsWith("[") && host.endsWith("]");
+        if (numeric)
+            host = host.substring(1, host.length() - 1);
+
+        return isJunk(context, host, true, BLOCK_LISTS);
     }
 
-    private static boolean isJunk(Context context, String host, List<BlockList> blocklists) {
+    static Boolean isJunk(Context context, List<Address> addresses) {
+        for (Address address : addresses) {
+            String email = ((InternetAddress) address).getAddress();
+            String domain = UriHelper.getEmailDomain(email);
+            if (domain == null)
+                continue;
+            if (isJunk(context, domain, false, BLOCK_LISTS))
+                return true;
+        }
+        return false;
+    }
+
+    private static boolean isJunk(Context context, String host, boolean numeric, List<BlockList> blocklists) {
         synchronized (cache) {
             CacheEntry entry = cache.get(host);
             if (entry != null && !entry.isExpired())
@@ -149,7 +169,9 @@ public class DnsBlockList {
 
         boolean blocked = false;
         for (BlockList blocklist : blocklists)
-            if (isEnabled(context, blocklist) && isJunk(host, blocklist)) {
+            if (isEnabled(context, blocklist) &&
+                    blocklist.numeric == numeric &&
+                    isJunk(host, blocklist)) {
                 blocked = true;
                 break;
             }
@@ -162,9 +184,6 @@ public class DnsBlockList {
     }
 
     private static boolean isJunk(String host, BlockList blocklist) {
-        boolean numeric = host.startsWith("[") && host.endsWith("]");
-        if (numeric)
-            host = host.substring(1, host.length() - 1);
         try {
             if (blocklist.numeric) {
                 long start = new Date().getTime();
@@ -202,7 +221,7 @@ public class DnsBlockList {
                         Log.w(ex);
                     }
                 }
-            } else if (!numeric) {
+            } else {
                 long start = new Date().getTime();
                 String lookup = host + "." + blocklist.address;
                 boolean junk = isJunk(lookup, blocklist.responses);