Show sender domain which will be blocked

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

@@ -305,12 +305,13 @@ public class FragmentDialogJunk extends FragmentDialogBase {
             }
         });
 
+        String domain = null;
         try {
             boolean common = false;
             Address[] froms = MessageHelper.parseAddresses(context, from);
             String email = (froms.length == 0 ? null : ((InternetAddress) froms[0]).getAddress());
             int at = (email == null ? -1 : email.indexOf('@'));
-            String domain = (at > 0 ? email.substring(at + 1).toLowerCase(Locale.ROOT) : null);
+            domain = (at > 0 ? email.substring(at + 1).toLowerCase(Locale.ROOT) : null);
 
             if (domain != null) {
                 List<String> domains = EmailProvider.getDomainNames(context);
@@ -341,6 +342,8 @@ public class FragmentDialogJunk extends FragmentDialogBase {
         cbBlockSender.setEnabled(canBlock);
         cbBlockDomain.setEnabled(false);
         cbBlockSender.setChecked(canBlock);
+        cbBlockDomain.setText(getString(R.string.title_block_sender_domain, domain));
+        cbBlockDomain.setVisibility(domain == null ? View.GONE : View.VISIBLE);
         ibMore.setImageLevel(1);
         cbBlocklist.setChecked(check_blocklist && use_blocklist);
         tvBlocklist.setText(TextUtils.join(", ", DnsBlockList.getNamesEnabled(context)));

app/src/main/res/layout/dialog_junk.xml

@@ -66,7 +66,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="12dp"
             android:layout_marginTop="12dp"
-            android:text="@string/title_block_domain"
+            android:text="@string/title_block_sender_domain"
             android:textAppearance="@style/TextAppearance.AppCompat.Small"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/cbBlockSender" />

app/src/main/res/values/strings.xml

@@ -92,7 +92,7 @@
 
     <string name="title_block">Block %1$s</string>
     <string name="title_block_sender">Block sender</string>
-    <string name="title_block_domain">Block sender domain</string>
+    <string name="title_block_sender_domain">Block domain \'%1$s\'</string>
     <string name="title_block_sender_hint">
         Blocking a sender is a free feature.
         Blocking a sender domain uses filter rules, which is a pro feature.