Added option to disable SASL authentication

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

@@ -142,6 +142,8 @@ public class EmailService implements AutoCloseable {
         boolean socks_enabled = prefs.getBoolean("socks_enabled", false);
         String socks_proxy = prefs.getString("socks_proxy", "localhost:9050");
 
+        boolean sasl = prefs.getBoolean("sasl", true);
+
         // SOCKS proxy
         if (socks_enabled) {
             String[] address = socks_proxy.split(":");
@@ -160,8 +162,10 @@ public class EmailService implements AutoCloseable {
         properties.put("mail.event.executor", executor);
 
         properties.put("mail." + protocol + ".sasl.enable", "true");
-        properties.put("mail." + protocol + ".sasl.mechanisms", "CRAM-MD5");
-        properties.put("mail." + protocol + ".sasl.realm", realm == null ? "" : realm);
+        if (sasl) {
+            properties.put("mail." + protocol + ".sasl.mechanisms", "CRAM-MD5");
+            properties.put("mail." + protocol + ".sasl.realm", realm == null ? "" : realm);
+        }
         properties.put("mail." + protocol + ".auth.ntlm.domain", realm == null ? "" : realm);
 
         // writetimeout: one thread overhead

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

@@ -70,6 +70,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
     private TextView tvFtsPro;
     private SwitchCompat swEnglish;
     private SwitchCompat swWatchdog;
+    private SwitchCompat swSasl;
     private SwitchCompat swOptimize;
     private SwitchCompat swUpdates;
     private SwitchCompat swExperiments;
@@ -93,7 +94,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
     private Group grpDebug;
 
     private final static String[] RESET_OPTIONS = new String[]{
-            "shortcuts", "fts", "english", "watchdog", "auto_optimize", "updates",
+            "shortcuts", "fts", "english", "watchdog", "sasl", "auto_optimize", "updates",
             "experiments", "crash_reports", "debug", "cleanup_attachments"
     };
 
@@ -124,6 +125,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         tvFtsPro = view.findViewById(R.id.tvFtsPro);
         swEnglish = view.findViewById(R.id.swEnglish);
         swWatchdog = view.findViewById(R.id.swWatchdog);
+        swSasl = view.findViewById(R.id.swSasl);
         swOptimize = view.findViewById(R.id.swOptimize);
         swUpdates = view.findViewById(R.id.swUpdates);
         swExperiments = view.findViewById(R.id.swExperiments);
@@ -223,6 +225,14 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             }
         });
 
+        swSasl.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("sasl", checked).apply();
+                ServiceSynchronize.reload(getContext(), -1L, false, "sasl=" + checked);
+            }
+        });
+
         swOptimize.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@@ -508,6 +518,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         swFts.setChecked(prefs.getBoolean("fts", false));
         swEnglish.setChecked(prefs.getBoolean("english", false));
         swWatchdog.setChecked(prefs.getBoolean("watchdog", true));
+        swSasl.setChecked(prefs.getBoolean("sasl", true));
         swOptimize.setChecked(prefs.getBoolean("auto_optimize", false));
         swUpdates.setChecked(prefs.getBoolean("updates", true));
         swUpdates.setVisibility(

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

@@ -146,6 +146,18 @@
             app:layout_constraintTop_toBottomOf="@id/tvEnglishHint"
             app:switchPadding="12dp" />
 
+        <androidx.appcompat.widget.SwitchCompat
+            android:id="@+id/swSasl"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:checked="true"
+            android:text="@string/title_advanced_sasl"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/swWatchdog"
+            app:switchPadding="12dp" />
+
         <androidx.appcompat.widget.SwitchCompat
             android:id="@+id/swOptimize"
             android:layout_width="0dp"
@@ -155,7 +167,7 @@
             android:text="@string/title_advanced_optimize"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/swWatchdog"
+            app:layout_constraintTop_toBottomOf="@id/swSasl"
             app:switchPadding="12dp" />
 
         <eu.faircode.email.FixedTextView

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

@@ -449,6 +449,7 @@
     <string name="title_advanced_fts_indexed">%1$d / %2$d messages indexed (%3$s)</string>
     <string name="title_advanced_english">Use US country settings</string>
     <string name="title_advanced_watchdog">Periodically check if FairEmail is still active</string>
+    <string name="title_advanced_sasl" translatable="false">CRAM-MD5</string>
     <string name="title_advanced_optimize">Automatically optimize settings</string>
     <string name="title_advanced_updates">Check for updates</string>
     <string name="title_advanced_experiments">Try experimental features</string>