Removed DNSSEC option

Needs to be per host

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

@@ -90,7 +90,7 @@ public class DnsHelper {
             String domain = UriHelper.getEmailDomain(email);
             if (domain == null)
                 continue;
-            DnsRecord[] records = _lookup(context, domain, "mx", CHECK_TIMEOUT);
+            DnsRecord[] records = _lookup(context, domain, "mx", CHECK_TIMEOUT, false);
             if (records.length == 0)
                 throw new UnknownHostException(domain);
         }
@@ -98,14 +98,13 @@ public class DnsHelper {
 
     @NonNull
     static DnsRecord[] lookup(Context context, String name, String type) {
-        return _lookup(context, name, type, LOOKUP_TIMEOUT);
+        return _lookup(context, name, type, LOOKUP_TIMEOUT, false);
     }
 
     @NonNull
-    private static DnsRecord[] _lookup(Context context, String name, String type, int timeout) {
+    private static DnsRecord[] _lookup(Context context, String name, String type, int timeout, boolean dns_secure) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         boolean dns_custom = prefs.getBoolean("dns_custom", false);
-        boolean dns_secure = prefs.getBoolean("dns_secure", false);
 
         String filter = null;
         int colon = type.indexOf(':');

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

@@ -98,7 +98,6 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
     private SwitchCompat swStandaloneVpn;
     private SwitchCompat swDnsCustom;
     private EditText etDnsExtra;
-    private SwitchCompat swDnsSecure;
     private SwitchCompat swTcpKeepAlive;
     private SwitchCompat swSslUpdate;
     private SwitchCompat swSslHarden;
@@ -131,7 +130,7 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
             "download_headers", "download_eml", "download_plain",
             "require_validated", "require_validated_captive", "vpn_only",
             "timeout", "prefer_ip4", "bind_socket", "standalone_vpn",
-            "dns_extra", "dns_custom", "dns_secure",
+            "dns_extra", "dns_custom",
             "tcp_keep_alive",
             "ssl_update", "ssl_harden", "ssl_harden_strict", "cert_strict", "cert_transparency", "check_names",
             "open_safe", "http_redirect",
@@ -166,7 +165,6 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
         swStandaloneVpn = view.findViewById(R.id.swStandaloneVpn);
         swDnsCustom = view.findViewById(R.id.swDnsCustom);
         etDnsExtra = view.findViewById(R.id.etDnsExtra);
-        swDnsSecure = view.findViewById(R.id.swDnsSecure);
         swTcpKeepAlive = view.findViewById(R.id.swTcpKeepAlive);
         swSslUpdate = view.findViewById(R.id.swSslUpdate);
         swSslHarden = view.findViewById(R.id.swSslHarden);
@@ -351,7 +349,6 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
                 DnsHelper.clear(buttonView.getContext());
                 prefs.edit().putBoolean("dns_custom", checked).apply();
                 etDnsExtra.setEnabled(checked || Build.VERSION.SDK_INT < Build.VERSION_CODES.Q);
-                swDnsSecure.setEnabled(checked);
             }
         });
 
@@ -372,15 +369,6 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
             }
         });
 
-        swDnsSecure.setVisibility(debug || BuildConfig.DEBUG ? View.VISIBLE : View.GONE);
-        swDnsSecure.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
-            @Override
-            public void onCheckedChanged(CompoundButton buttonView, boolean checked) {
-                DnsHelper.clear(buttonView.getContext());
-                prefs.edit().putBoolean("dns_secure", checked).apply();
-            }
-        });
-
         swTcpKeepAlive.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@@ -768,8 +756,6 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
             swDnsCustom.setChecked(prefs.getBoolean("dns_custom", false));
             etDnsExtra.setText(prefs.getString("dns_extra", null));
             etDnsExtra.setEnabled(swDnsCustom.isChecked() || Build.VERSION.SDK_INT < Build.VERSION_CODES.Q);
-            swDnsSecure.setChecked(prefs.getBoolean("dns_secure", false));
-            swDnsSecure.setEnabled(swDnsCustom.isChecked());
             swTcpKeepAlive.setChecked(prefs.getBoolean("tcp_keep_alive", false));
             swSslUpdate.setChecked(prefs.getBoolean("ssl_update", true));
             swSslHarden.setChecked(prefs.getBoolean("ssl_harden", false));

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

@@ -172,7 +172,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
             "sync_shared_folders",
             "download_headers", "download_eml",
             "prefer_ip4", "bind_socket", "standalone_vpn", // force reconnect
-            "dns_extra", "dns_custom", "dns_secure", // force reconnect
+            "dns_extra", "dns_custom", // force reconnect
             "tcp_keep_alive", // force reconnect
             "ssl_harden", "ssl_harden_strict", "cert_strict", "cert_transparency", "check_names", "bouncy_castle", "bc_fips", // force reconnect
             "experiments", "debug", "protocol", // force reconnect

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

@@ -461,18 +461,6 @@
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toBottomOf="@id/tvDns" />
 
-                <androidx.appcompat.widget.SwitchCompat
-                    android:id="@+id/swDnsSecure"
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_marginStart="12dp"
-                    android:layout_marginTop="12dp"
-                    android:text="@string/title_advanced_dns_secure"
-                    app:layout_constraintEnd_toEndOf="parent"
-                    app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toBottomOf="@id/etDnsExtra"
-                    app:switchPadding="12dp" />
-
                 <androidx.appcompat.widget.SwitchCompat
                     android:id="@+id/swTcpKeepAlive"
                     android:layout_width="0dp"
@@ -482,7 +470,7 @@
                     android:text="@string/title_advanced_tcp_keep_alive"
                     app:layout_constraintEnd_toEndOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toBottomOf="@id/swDnsSecure"
+                    app:layout_constraintTop_toBottomOf="@id/etDnsExtra"
                     app:switchPadding="12dp" />
 
                 <TextView