Simplification

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

@@ -455,14 +455,7 @@ public class MailService implements AutoCloseable {
             SSLContext sslContext = SSLContext.getInstance("TLS");
 
             TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
-            try {
-                KeyStore ks = KeyStore.getInstance("AndroidCAStore");
-                ks.load(null, null);
-                tmf.init(ks);
-            } catch (IOException ex) {
-                Log.e(ex);
             tmf.init((KeyStore) null);
-            }
 
             TrustManager[] tms = tmf.getTrustManagers();
             if (tms == null || tms.length == 0 || !(tms[0] instanceof X509TrustManager)) {

app/src/main/res/xml/network_security_config.xml

@@ -4,6 +4,7 @@
     <base-config cleartextTrafficPermitted="true">
         <trust-anchors>
             <certificates src="system" />
+            <certificates src="user" />
         </trust-anchors>
     </base-config>
 </network-security-config>